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Perk Runtime Reference

This page documents runtime location evidence for each perk in:

  • Original: Crimsonland v1.9.93 (analysis/ghidra/raw/crimsonland.exe_decompiled.c)
  • Rewrite parity implementation: Python port (src/)

For gameplay effects and mechanics, see Perks. For rewrite ID/name mapping, see src/crimson/perks/ids.py. For decompile constants/addresses, see Detangling notes.

Notes:

  • Many perk effects are implemented by a small set of hot paths in the original: perk_apply (0x004055e0), perks_update_effects (0x00406b40), player_update (0x004136b0), player_fire_weapon (0x00444980), player_take_damage (0x00425e50), creature_update_all (0x00426220), creature_apply_damage (0x004207c0), projectile_update (0x00420b90), and rendering passes.
  • In the rewrite, perk counts live on PlayerState.perk_counts and are typically treated as shared state across players (synced from player 0).

0. AntiPerk (PerkId.ANTIPERK)

Original

  • perk_can_offer (0x0042fb10): explicitly rejects perk_id_antiperk.

Rewrite

  • src/crimson/perks/availability.py: perk_can_offer() rejects PerkId.ANTIPERK.

1. Bloody Mess / Quick Learner (PerkId.BLOODY_MESS_QUICK_LEARNER)

Original

  • Kill XP: creature death handling (via creature_update_all → creature_handle_death path).
  • Hit FX: projectile hit handling queues extra decals / blood splatter when the perk is active and blood is enabled.

Rewrite

  • XP multiplier on kill: src/crimson/creatures/runtime.py: CreaturePool._start_death().
  • Extra hit decals/blood: src/crimson/game_world.py: GameWorld._queue_projectile_decals().
  • Name/description toggle: src/crimson/perks/ids.py: perk_display_name() / perk_display_description().

2. Sharpshooter (PerkId.SHARPSHOOTER)

Original

  • player_update (0x004136b0): forces spread_heat = 0.02 while active.
  • player_fire_weapon (0x00444980): applies shot_cooldown *= 1.05 and avoids the normal post-shot spread heat increase.
  • Rendering: draws the laser overlay in the player render path.

Rewrite

  • Shot cooldown and spread behavior: src/crimson/gameplay.py: player_fire_weapon(), player_update().
  • Laser rendering: src/crimson/render/world_renderer.py: _draw_sharpshooter_laser_sight().

3. Fastloader (PerkId.FASTLOADER)

Original

  • player_start_reload (0x00413430): applies the multiplier when starting a reload.

Rewrite

  • src/crimson/gameplay.py: player_start_reload().

4. Lean Mean Exp. Machine (PerkId.LEAN_MEAN_EXP_MACHINE)

Original

  • perks_update_effects (0x00406b40): timer-based periodic XP grant.

Rewrite

  • src/crimson/perks/runtime/effects.py: perks_update_effects().
  • Lean Mean step: src/crimson/perks/impl/lean_mean_exp_machine_effect.py: update_lean_mean_exp_machine().

5. Long Distance Runner (PerkId.LONG_DISTANCE_RUNNER)

Original

  • player_update (0x004136b0): move-speed ramp/decay logic with perk-enabled extension to 2.8.

Rewrite

  • src/crimson/gameplay.py: player_update().

6. Pyrokinetic (PerkId.PYROKINETIC)

Original

  • perks_update_effects (0x00406b40): selects an aim target via creature_find_in_radius(..., 12.0, 0) and runs the timer/FX emission.

Rewrite

  • src/crimson/perks/runtime/effects.py: perks_update_effects().
  • Pyrokinetic step: src/crimson/perks/impl/pyrokinetic_effect.py: update_pyrokinetic().

7. Instant Winner (PerkId.INSTANT_WINNER)

Original

  • perk_apply (0x004055e0): adds 2500 XP.

Rewrite

  • src/crimson/perks/runtime/apply.py: perk_apply() dispatches to:
  • src/crimson/perks/impl/instant_winner.py: apply_instant_winner().

8. Grim Deal (PerkId.GRIM_DEAL)

Original

  • perk_apply (0x004055e0): experience += int(experience * 0.18) then health = -1.0.

Rewrite

  • src/crimson/perks/runtime/apply.py: perk_apply() dispatches to:
  • src/crimson/perks/impl/grim_deal.py: apply_grim_deal().

9. Alternate Weapon (PerkId.ALTERNATE_WEAPON)

Original

  • player_apply_move_with_spawn_avoidance (0x0041e290): movement scaling.
  • player_update (0x004136b0): reload-triggered swap behavior + shot cooldown bump.
  • perk_can_offer (0x0042fb10): mode-flag gating (flags & 0x2) prevents offers in two-player.

Rewrite

  • Swap and carry behavior: src/crimson/gameplay.py: player_swap_alt_weapon(), player_update().
  • Bonus application during swap path: src/crimson/bonuses/apply.py: bonus_apply().
  • Offer gating: src/crimson/perks/availability.py: perk_can_offer().

10. Plaguebearer (PerkId.PLAGUEBEARER)

Original

  • perk_apply (0x004055e0): sets player_plaguebearer_active (global-ish field on player0).
  • creature_update_all (0x00426220): infection flagging, ticking, spread (plaguebearer_spread_infection), and infection kill bookkeeping.
  • perk_can_offer (0x0042fb10): hardcore quest 2-10 special-case blocks Plaguebearer.

Rewrite

  • Flag application: src/crimson/perks/runtime/apply.py: perk_apply() dispatches to:
  • src/crimson/perks/impl/plaguebearer.py: apply_plaguebearer() (sets plaguebearer_active for all players).
  • Creature-side behavior: src/crimson/creatures/runtime.py: CreaturePool.update() (contact infection, tick damage, spread).
  • Offer gating: src/crimson/perks/availability.py: perk_can_offer() hardcore quest gate.

11. Evil Eyes (PerkId.EVIL_EYES)

Original

  • perks_update_effects (0x00406b40): updates evil_eyes_target_creature via creature_find_in_radius.
  • creature_update_all (0x00426220): skips AI update for the targeted creature.

Rewrite

  • src/crimson/perks/runtime/effects.py: perks_update_effects().
  • Evil Eyes step: src/crimson/perks/impl/evil_eyes_effect.py: update_evil_eyes_target().
  • Freeze behavior: src/crimson/creatures/runtime.py: CreaturePool.update() (evil-eyes target handling).

12. Ammo Maniac (PerkId.AMMO_MANIAC)

Original

  • perk_apply (0x004055e0): reassigns each player's current weapon to force clip recalculation.
  • weapon_assign_player (0x00452d40): applies the clip-size modifier.

Rewrite

  • Clip sizing: src/crimson/gameplay.py: weapon_assign_player() (Ammo Maniac modifier).
  • Apply-time reassignment: src/crimson/perks/runtime/apply.py: perk_apply() dispatches to:
  • src/crimson/perks/impl/ammo_maniac.py: apply_ammo_maniac().

13. Radioactive (PerkId.RADIOACTIVE)

Original

  • creature_update_all (0x00426220): proximity check, timer wrap, falloff damage; special-case kill/XP handling.
  • Rendering: draws the player aura (effect atlas id 0x10).

Rewrite

  • Gameplay: src/crimson/creatures/runtime.py: CreaturePool.update() (Radioactive tick and kill handling).
  • Rendering: src/crimson/render/world_renderer.py: player aura in _draw_player_trooper_sprite().

14. Fastshot (PerkId.FASTSHOT)

Original

  • player_fire_weapon (0x00444980): applies the cooldown multiplier.

Rewrite

  • src/crimson/gameplay.py: player_fire_weapon().

15. Fatal Lottery (PerkId.FATAL_LOTTERY)

Original

  • perk_apply (0x004055e0): (crt_rand() & 1) decides XP vs death.
  • perk_can_offer (0x0042fb10): mode-flag gating rejects the perk in quest mode and two-player.

Rewrite

  • src/crimson/perks/runtime/apply.py: perk_apply() dispatches to:
  • src/crimson/perks/impl/fatal_lottery.py: apply_fatal_lottery().
  • Offer gating: src/crimson/perks/availability.py: perk_can_offer().

16. Random Weapon (PerkId.RANDOM_WEAPON)

Original

  • perk_apply (0x004055e0): random selection (weapon_pick_random_available) with up to 100 retries to avoid pistol/current, then weapon_assign_player with the last roll.

Rewrite

  • src/crimson/perks/runtime/apply.py: perk_apply() dispatches to:
  • src/crimson/perks/impl/random_weapon.py: apply_random_weapon().

17. Mr. Melee (PerkId.MR_MELEE)

Original

  • creature_update_all (0x00426220): on contact-damage tick, calls creature_apply_damage(attacker, 25, damage_type=2, impulse=(0,0)) when Mr. Melee is active, without suppressing the player damage path.

Rewrite

  • src/crimson/creatures/runtime.py: _creature_interaction_contact_damage() (Mr. Melee branch + deferred death handling).

18. Anxious Loader (PerkId.ANXIOUS_LOADER)

Original

  • player_update (0x004136b0): checks input_primary_just_pressed() and applies the timer reduction.

Rewrite

  • src/crimson/gameplay.py: player_update().

19. Final Revenge (PerkId.FINAL_REVENGE)

Original

  • player_take_damage (0x00425e50): death check triggers the revenge burst and radial damage via creature_apply_damage (damage type 3).
  • perk_can_offer (0x0042fb10): mode-flag gating rejects the perk in quest mode and two-player.

Rewrite

  • Death hook implementation: src/crimson/perks/impl/final_revenge.py: apply_final_revenge_on_player_death().
  • Hook wiring and death pipeline call-site: src/crimson/sim/world_state.py.
  • Offer gating: src/crimson/perks/availability.py: perk_can_offer().

20. Telekinetic (PerkId.TELEKINETIC)

Original

  • Bonus update logic uses a per-player aim-hover timer and a fixed delay threshold.

Rewrite

  • src/crimson/bonuses/update.py: bonus_telekinetic_update().
  • src/crimson/bonuses/pool.py: bonus_find_aim_hover_entry().

21. Perk Expert (PerkId.PERK_EXPERT)

Original

  • Perk selection UI logic adjusts choice count and layout while the perk is active.

Rewrite

  • Choice count: src/crimson/perks/selection.py: perk_choice_count().
  • UI layout + sponsor text: src/crimson/ui/perk_menu.py, src/crimson/views/perks.py.

22. Unstoppable (PerkId.UNSTOPPABLE)

Original

  • player_take_damage (0x00425e50): gates the disruption logic on perk presence.

Rewrite

  • src/crimson/player_damage.py: player_take_damage().

23. Regression Bullets (PerkId.REGRESSION_BULLETS)

Original

  • player_fire_weapon (0x00444980): implements the "fire during reload by paying XP" path; this branch is gated by experience > 0.
  • player_start_reload (0x00413430): reload restart guard when Regression Bullets or Ammunition Within is active.

Rewrite

  • src/crimson/gameplay.py: player_fire_weapon() (reload firing + XP drain), player_start_reload() (restart guard).

24. Infernal Contract (PerkId.INFERNAL_CONTRACT)

Original

  • perk_apply (0x004055e0): applies the health reduction and perk/level grants.
  • Perk offering logic blocks the perk under Death Clock.

Rewrite

  • Apply: src/crimson/perks/runtime/apply.py: perk_apply() dispatches to:
  • src/crimson/perks/impl/infernal_contract.py: apply_infernal_contract().
  • Selection/gating: src/crimson/perks/selection.py: perk_generate_choices().

25. Poison Bullets (PerkId.POISON_BULLETS)

Original

  • projectile_update (0x00420b90): sets weak poison on hit (flags |= 0x01) when (crt_rand() & 7) == 1.
  • creature_update_all (0x00426220): applies self-damage using creature_apply_damage(..., damage_type=0, impulse=(0,0)).
  • Toxic Avenger does not modify this projectile-hit poison branch; strong poison (flags |= 0x02) comes from Toxic Avenger melee retaliation in creature_update_all.
  • Rendering: creature overlay draws aura 0x10 when poison flag is set.
  • perk_can_offer (0x0042fb10): hardcore quest 2-10 special-case blocks Poison Bullets.

Rewrite

  • Poison flagging: src/crimson/projectiles.py: ProjectilePool.update() hit logic.
  • Poison tick: src/crimson/creatures/runtime.py: CreaturePool.update() routes self-damage through creature_apply_damage().
  • Aura render: src/crimson/render/world_renderer.py: creature overlay in WorldRenderer.draw().
  • Offer gating: src/crimson/perks/availability.py: perk_can_offer() hardcore quest gate.

26. Dodger (PerkId.DODGER)

Original

  • player_take_damage (0x00425e50): Dodger is crt_rand() % 5 == 0 if Ninja is not active.

Rewrite

  • src/crimson/player_damage.py: player_take_damage().

27. Bonus Magnet (PerkId.BONUS_MAGNET)

Original

  • Bonus spawn-on-kill logic (bonus_try_spawn_on_kill): additional roll gates on perk.

Rewrite

  • src/crimson/bonuses/pool.py: BonusPool.try_spawn_on_kill().

28. Uranium Filled Bullets (PerkId.URANIUM_FILLED_BULLETS)

Original

  • creature_apply_damage (0x004207c0): when damage_type == 1, doubles damage.

Rewrite

  • src/crimson/creatures/damage.py: creature_apply_damage().

29. Doctor (PerkId.DOCTOR)

Original

  • creature_apply_damage (0x004207c0): bullet damage scaling.
  • Target selection: uses creature_find_in_radius(aim, 12.0, 0).
  • HUD draw: draws a 64px bar with the clamped health/max_health ratio.

Rewrite

  • Damage: src/crimson/creatures/damage.py: creature_apply_damage().
  • UI: src/crimson/modes/base_gameplay_mode.py: _draw_target_health_bar(), and src/crimson/ui/hud.py: draw_target_health_bar().

30. Monster Vision (PerkId.MONSTER_VISION)

Original

  • Selection: no FX-detail offer gate in perks_generate_choices; Monster Vision is part of the 25% rarity reject group.
  • Rendering: creature render pass draws 0x10 behind creatures; shadow pass is disabled while active.

Rewrite

  • Offer gating: src/crimson/perks/availability.py: perk_can_offer().
  • Perk selection: src/crimson/perks/selection.py: perk_generate_choices().
  • Rendering: src/crimson/render/world_renderer.py: WorldRenderer.draw() (Monster Vision overlay and shadow gating).

31. Hot Tempered (PerkId.HOT_TEMPERED)

Original

  • player_update (0x004136b0): timer logic + randomized interval + ring spawn.

Rewrite

  • src/crimson/perks/impl/hot_tempered.py: tick_hot_tempered().

32. Bonus Economist (PerkId.BONUS_ECONOMIST)

Original

  • Bonus application scales duration increments while the perk is active.

Rewrite

  • src/crimson/bonuses/apply.py: bonus_apply() (economist multiplier).

33. Thick Skinned (PerkId.THICK_SKINNED)

Original

  • perk_apply (0x004055e0): health scaling on pick.
  • player_take_damage (0x00425e50): damage scaling.
  • Perk offering blocks it under Death Clock.

Rewrite

  • src/crimson/perks/runtime/apply.py: perk_apply() dispatches to:
  • src/crimson/perks/impl/thick_skinned.py: apply_thick_skinned().
  • src/crimson/player_damage.py: player_take_damage().
  • Offer gating: src/crimson/perks/selection.py: perk_generate_choices().

34. Barrel Greaser (PerkId.BARREL_GREASER)

Original

  • creature_apply_damage (0x004207c0): bullet damage scaling.
  • projectile_update (0x00420b90): doubles the movement step count when the perk is active and the projectile is player-owned.

Rewrite

  • Damage: src/crimson/creatures/damage.py: creature_apply_damage().
  • Projectile stepping: src/crimson/projectiles.py: ProjectilePool.update().

35. Ammunition Within (PerkId.AMMUNITION_WITHIN)

Original

  • player_fire_weapon (0x00444980): implements the "fire during reload by paying health" path; this branch is also gated by experience > 0.
  • player_start_reload (0x00413430): restart guard.

Rewrite

  • src/crimson/gameplay.py: player_fire_weapon() and player_start_reload().

36. Veins of Poison (PerkId.VEINS_OF_POISON)

Original

  • creature_update_all (0x00426220): on contact-damage, checks shield_timer and sets poison flags.
  • Perk offering: hardcore quest gating.

Rewrite

  • Contact poison flagging: src/crimson/creatures/runtime.py: _creature_interaction_contact_damage().
  • Offer gating: src/crimson/perks/availability.py: perk_can_offer().

37. Toxic Avenger (PerkId.TOXIC_AVENGER)

Original

  • creature_update_all (0x00426220): sets both weak+strong poison flags.

Rewrite

  • src/crimson/creatures/runtime.py: _creature_interaction_contact_damage().

38. Regeneration (PerkId.REGENERATION)

Original

  • perks_update_effects (0x00406b40): heal loop.

Rewrite

  • src/crimson/perks/runtime/effects.py: perks_update_effects().
  • Regeneration step: src/crimson/perks/impl/regeneration_effect.py: update_regeneration().

39. Pyromaniac (PerkId.PYROMANIAC)

Original

  • creature_apply_damage (0x004207c0): fire damage scaling and a crt_rand() side-effect.
  • Perk offering logic gates by current weapon.

Rewrite

  • Damage: src/crimson/creatures/damage.py: creature_apply_damage().
  • Offer gating: src/crimson/perks/selection.py: perk generation rules (perk_generate_choices() weapon gate).

40. Ninja (PerkId.NINJA)

Original

  • player_take_damage (0x00425e50): Ninja dodge check is evaluated before Dodger.

Rewrite

  • src/crimson/player_damage.py: player_take_damage().

41. Highlander (PerkId.HIGHLANDER)

Original

  • player_take_damage (0x00425e50): Highlander replacement behavior.
  • perk_can_offer (0x0042fb10): mode-flag gating rejects Highlander in quest mode and two-player.
  • perks_generate_choices (0x00430160): Death Clock active path rejects Highlander from offers.

Rewrite

  • src/crimson/player_damage.py: player_take_damage().
  • Offer gating: src/crimson/perks/availability.py: perk_can_offer(), plus Death Clock block in src/crimson/perks/selection.py: perk_generate_choices().

42. Jinxed (PerkId.JINXED)

Original

  • perks_update_effects (0x00406b40): manages the timer and both the self-damage and random-creature-death branches.

Rewrite

  • src/crimson/perks/runtime/effects.py: perks_update_effects().
  • Jinxed steps: src/crimson/perks/impl/jinxed_effect.py: update_jinxed_timer(), update_jinxed().

43. Perk Master (PerkId.PERK_MASTER)

Original

  • Perk selection UI logic increases the choice count.

Rewrite

  • src/crimson/perks/selection.py: perk_choice_count().

44. Reflex Boosted (PerkId.REFLEX_BOOSTED)

Original

  • Main loop: when in gameplay state, frame_dt *= 0.9 while active.

Rewrite

  • src/crimson/sim/world_state.py: WorldState.step().

45. Greater Regeneration (PerkId.GREATER_REGENERATION)

Original

  • No active tick/usage located in the authoritative decompile; only selection/apply bookkeeping references.

Rewrite

  • Default rewrite mode: Greater Regeneration upgrades Regeneration heal ticks from +dt to +2*dt (same RNG gate in perks_update_effects).
  • With --preserve-bugs: no runtime effect (matches original).
  • Implementation: src/crimson/perks/impl/regeneration_effect.py: update_regeneration().
  • Cleared by Death Clock apply: src/crimson/perks/impl/death_clock.py: apply_death_clock().

46. Breathing Room (PerkId.BREATHING_ROOM)

Original

  • perk_apply (0x004055e0): applies health reduction, forces creature hitbox ramp, clears guard.

Rewrite

  • src/crimson/perks/runtime/apply.py: perk_apply() dispatches to:
  • src/crimson/perks/impl/breathing_room.py: apply_breathing_room().

47. Death Clock (PerkId.DEATH_CLOCK)

Original

  • perk_apply (0x004055e0): clears regen perks and sets health to 100.
  • player_take_damage (0x00425e50): early-return immunity.
  • projectile_update (0x00420b90): player-hit path directly subtracts fixed projectile damage (bypasses player_take_damage).
  • perks_update_effects (0x00406b40): per-frame drain logic.
  • bonus_pick_random_type (0x00412470): medikit suppression while active.
  • Perk offering: blocks multiple perks while active.

Rewrite

  • Apply: src/crimson/perks/runtime/apply.py: perk_apply() dispatches to:
  • src/crimson/perks/impl/death_clock.py: apply_death_clock().
  • Offer gating: src/crimson/perks/selection.py: perk_generate_choices().
  • Medikit suppression: src/crimson/gameplay.py: bonus_pick_random_type().
  • Damage immunity: src/crimson/player_damage.py: player_take_damage().
  • Projectile player-hit damage path: src/crimson/player_damage.py: player_take_projectile_damage(), called from src/crimson/projectiles.py: ProjectilePool.update().
  • src/crimson/perks/runtime/effects.py: perks_update_effects().
  • Death Clock step: src/crimson/perks/impl/death_clock.py: update_death_clock().

48. My Favourite Weapon (PerkId.MY_FAVOURITE_WEAPON)

Original

  • perk_apply (0x004055e0): immediate +2 clip size.
  • weapon_assign_player (0x00452d40): applies +2 on assignment.
  • Bonus selection/spawn logic removes weapon bonuses while active.

Rewrite

  • src/crimson/perks/runtime/apply.py: perk_apply() dispatches to:
  • src/crimson/perks/impl/my_favourite_weapon.py: apply_my_favourite_weapon().
  • src/crimson/gameplay.py: weapon_assign_player(), bonus_pick_random_type().
  • src/crimson/bonuses/pool.py: BonusPool.try_spawn_on_kill().
  • src/crimson/bonuses/apply.py: bonus_apply().

49. Bandage (PerkId.BANDAGE)

Original

  • perk_apply (0x004055e0): random multiply + clamp + burst FX.

Rewrite

  • Default rewrite mode: heals +1..+50 HP (clamped to 100), matching the in-game perk description text.
  • With --preserve-bugs: keeps the native multiplier behavior (health *= 1..50).
  • src/crimson/perks/runtime/apply.py: perk_apply() dispatches to:
  • src/crimson/perks/impl/bandage.py: apply_bandage().

50. Angry Reloader (PerkId.ANGRY_RELOADER)

Original

  • player_update (0x004136b0): half-threshold detection and ring spawn.

Rewrite

  • src/crimson/gameplay.py: player_update() reload perks section.

51. Ion Gun Master (PerkId.ION_GUN_MASTER)

Original

  • creature_apply_damage (0x004207c0): ion damage scaling (damage type 7).
  • projectile_update (0x00420b90): ion AoE scale.

Rewrite

  • Damage: src/crimson/creatures/damage.py: creature_apply_damage().
  • AoE radii: src/crimson/projectiles.py: ion behavior scaling.

52. Stationary Reloader (PerkId.STATIONARY_RELOADER)

Original

  • player_update (0x004136b0): compares previous/current position to decide reload_scale = 3.0.

Rewrite

  • src/crimson/gameplay.py: player_update().

53. Man Bomb (PerkId.MAN_BOMB)

Original

  • player_update (0x004136b0): timer accumulation/reset and ring spawn logic.
  • Ordering detail: player_man_bomb_timer is incremented/checked before the later movement gate clears it (player_state + 0x7c = 0) when position changed.

Rewrite

  • src/crimson/perks/impl/man_bomb.py: tick_man_bomb() mirrors native ordering (burst check first, movement reset after).
  • Movement/stationary state feed: src/crimson/gameplay.py: player_update().

54. Fire Cough (PerkId.FIRE_CAUGH)

Original

  • player_update (0x004136b0): timer and interval rerolling.
  • Uses projectile_spawn(..., PROJECTILE_TYPE_FIRE_BULLETS, owner_id) plus fx_spawn_sprite(...).

Rewrite

  • src/crimson/perks/impl/fire_cough.py: tick_fire_cough().
  • Player aim/input feed: src/crimson/gameplay.py: player_update() (sprite FX via GameplayState.sprite_effects).

55. Living Fortress (PerkId.LIVING_FORTRESS)

Original

  • player_update (0x004136b0): timer accumulation/reset.
  • creature_apply_damage (0x004207c0): bullet damage scaling.

Rewrite

  • Timer: src/crimson/gameplay.py: player_update().
  • Damage: src/crimson/creatures/damage.py: creature_apply_damage().

56. Tough Reloader (PerkId.TOUGH_RELOADER)

Original

  • player_take_damage (0x00425e50): checks reload_active and halves damage.

Rewrite

  • src/crimson/player_damage.py: player_take_damage().

57. Lifeline 50-50 (PerkId.LIFELINE_50_50)

Original

  • perk_apply (0x004055e0): direct deactivation in pool iteration order, plus burst FX.

Rewrite

  • src/crimson/perks/runtime/apply.py: perk_apply() dispatches to:
  • src/crimson/perks/impl/lifeline_50_50.py: apply_lifeline_50_50().