Modding Effects

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This page documents the various effects in the vanilla game. Modders can apply these effects to their custom content.

This table doesn't fully explain how to use these effects. Please view their items/characters/weapons for usage.

The headings separate the files by their location, but effects can often be applied to things outside of that heading, eg. my effects in res://effects/items/*.gd are applied to characters too.

Item Effects

Despite the heading, these effects can actually be used by characters and weapons too. They're just stored in effects/items.

Effect File (*.gd)	key	text_key	Items	Characters	Misc
effect	Effect key, eg: stat_max_hp / bounce	not specified	many	-	-
alien_eyes_effect	alien_eyes	effect_alien_eyes	Alien Eyes	-	-
anvil_effect	upgrade_random_weapon	effect_upgrade_random_weapon	Anvil
burn_chance_effect	burn_chance	effect_burn_chance	Scared Sausage	-	-
class_bonus_effect	effect_weapon_class_bonus	not specified	-	Brawler, Crazy, Doctor, Ghost, Wildling	-
convert_stat_effect	materials	effect_convert_stat_end_of_wave	-	Demon	-
dmg_when_death_effect	dmg_when_death_from_luck	effect_deal_dmg_when_death	Cyberball	-	-
dmg_when_pickup_gold_effect	dmg_when_pickup_gold_from_luck	effect_deal_dmg_when_pickup_gold	Baby Elephant	Lucky	-
gain_stat_for_every_stat_effect	Effect key, eg: stat_max_hp / bounce	many	-	Artificer, Chunky, Generalist, Hunter, Knight, Saver, Speedy	-
gain_stat_for_every_stat_effect	stat_attack_speed	effect_gain_stat_for_every_enemy	Community Support	-	-
gain_stat_for_every_stat_effect	stat_hp_regeneration	effect_gain_stat_for_every_perm_stat	Esty's Couch	-	-
gain_stat_for_every_stat_effect	stat_max_hp	effect_gain_stat_for_every_stat	Padding	-	-
gain_stat_for_every_stat_effect	stat_percent_damage	effect_gain_stat_for_every_perm_stat	Power Generator	-	-
gain_stat_for_every_stat_effect	stat_attack_speed	effect_gain_stat_for_every_stat	Retromations Hoodie	-	-
gain_stat_for_every_stat_effect	stat_engineering	effect_gain_stat_for_every_stat	Strange Book	-	-
healing_effect	effect_heal	not specified	-	-	Fruit, LegendaryBox
hp_cap_effect	hp_cap	effect_hp_cap_at_current_value	Handcuffs	-	-
item_exploding_effect	explode_on_hit	effect_explode_on_hit	-	Bull	-
item_exploding_effect	explode_on_death	effect_explode_on_death	Landmine Rip and Tear	-	-
pacifist_effect	pacifist	effect_pacifist	-	Pacifist	-
projectile_effect	projectiles_on_death	effect_projectiles_on_death	Baby with a Beard	-	-
remove_speed_effect	remove_speed	effect_remove_speed	Ugly Tooth	-	-
replace_effect	double_hp_regen_below_half_health	effect_double_hp_regen_below_half_health	Potion	-	-
replace_effect	minimum_weapons_in_shop	effect_minimum_weapon_in_shop	-	Arms Dealer	-
replace_effect	weapon_slot	effect_no_weapons	-	Bull	-
replace_effect	hp_shop	effect_hp_shop	-	Demon	-
replace_effect	trees_start_wave	not specified	-	Explorer	-
replace_effect	max_melee_weapons	effect_generalist	-	Generalist	-
replace_effect	max_ranged_weapons	[EMPTY]	-	Generalist	-
replace_effect	dodge_cap	effect_dodge_cap	-	Ghost	-
replace_effect	weapon_slot	effect_max_weapons	-	Multitasker	-
replace_effect	can_attack_while_moving	effect_cant_attack_while_moving	-	Soldier	-
replace_effect	double_boss	effect_double_boss	-	-	Danger5
starting_item_effect	starting_item	effect_starting_item	-	Brawler, Crazy, Engineer, Mage, Pacifist, Ranger, Saver, Wildling	-
stat_effect	stat_armor	effect_stat_while_not_moving	Barricade	-	-
stat_effect	stat_dodge	effect_stat_while_not_moving	Chameleon	-	-
stat_effect	gold_on_crit_kill	effect_gold_on_crit_kill	Hunting Trophy	-	-
stat_effect	stat_attack_speed	effect_stat_while_not_moving	Statue	-	-
stat_effect	stat_percent_damage	effect_on_hit	Triangle of Power	-	-
stat_effect	stat_percent_damage	effect_gain_stat_end_of_wave	Vigilante Ring	-	-
stat_effect	stat_percent_damage	effect_stack_stat	Wisdom	-	-
stat_effect	stat_max_hp	effect_gain_stat_end_of_wave	Grind's Magical Leaf	-	-
stat_effect	stat_hp_regeneration	effect_gain_stat_end_of_wave	Grind's Magical Leaf	-	-
stat_effect	stat_lifesteal	effect_gain_stat_end_of_wave	Grind's Magical Leaf	-	-
stat_gains_modification_effect	effect_increase_stat_gains	not specified	-	Many	-
stat_gains_modification_effect	effect_reduce_stat_gains	not specified	-	Many	-
structure_effect	not specified	effect_landmines	Landmines	-	Screwdriver
tier_effect	min_weapon_tier	effect_min_weapon_tier	-	Knight	-
tier_effect	max_weapon_tier	effect_max_weapon_tier	-	Wildling	-
turret_effect	not specified	effect_turret	Turret	-	Wrench
turret_effect	not specified	effect_turret_healing	Healing Turret	-	-
turret_effect	not specified	effect_turret_laser	Laser Turret	-	-
turret_effect	not specified	effect_turret_rocket	Rocket Turret	-	-
turret_effect	not specified	effect_tyler	Tyler (Turret)	-	-
turret_effect	wandering_bot	effect_wandering_bot	Wandering Bot	-	-
turret_flame_effect	not specified	effect_turret_flame	Flame Turret	-	Wrench (Tier2)
unique_weapon_effect	stat_attack_speed	effect_unique_weapon_bonus	Focus	-	-
unique_weapon_effect	stat_attack_speed	effect_unique_weapon_bonus	Spider	-	-
weapon_bonus_effect	???	???	unused	-	-
weapon_gain_effect	???	???	unused		-

Weapon Effects

Like Item Effects above, some of these can be used by items/characters.

Effect File (*.gd)	key	Used By
burning_effect	effect_burning	Flame Turret, Flaming Knuckles, Torch, Flamethrower, Wand
exploding_effect	effect_explode_melee	Plank, Plasma Sledgehammer, Power Fist, Nuclear Launcher, Shredder
gain_stat_every_killed_enemies_effect	effect_gain_stat_every_killed_enemies	Ghost Axe, Ghost Flint, Ghost Scepter
null_effect	effect_no_modifiers	Danger 0
null_effect	effect_new_enemies	Danger 1 (and above)
null_effect	effect_elites	Danger 2 (and above)
null_effect	effect_more_elites	Danger 4 (and above)
projectiles_on_hit_effect	effect_projectiles_on_hit	Cactus Mace, Sniper Gun
projectiles_on_hit_effect	effect_lightning_on_hit	Lightning Shiv
projectiles_on_hit_effect	effect_slow_projectiles_on_hit	Thunder Sword
slow_in_zone_effect	effect_slow_in_zone	Taser
weapon_stack_effect	effect_weapon_stack	Stick

List of Effect Keys

Lists most of the effect keys, taken the effect init arrays in run_data.gd (init_tracked_effects & init_effects). Many of these can be applied with effect.gd (res://items/global/effect.gd).

See Stats > Secondary Stats for a list of the items these effects can apply to.

Primary Stats

Effect Key	Notes
stat_max_hp	Max HP
stat_hp_regeneration	HP Regeneration
stat_lifesteal	Life Steal
stat_percent_damage	Damage
stat_melee_damage	Melee Damage
stat_ranged_damage	Ranged Damage
stat_elemental_damage	Elemental Damage
stat_attack_speed	Attack Speed
stat_crit_chance	Crit Chance
stat_engineering	Engineering
stat_range	Range
stat_armor	Armor
stat_dodge	Dodge
stat_speed	Speed
stat_luck	Luck
stat_harvesting	Harvesting

Misc

Some of these are repeated from above, others are only set with effect_key. Search the decompiled project for effect_key to find the latter.

List of effects via: res://singletons/run_data.gd > func init_effects

Also try searching: RunData.effects["effect_key"] (replace effect_key with a key).

See also: List of %/flat stat text modifiers: res://singletons/text.gd

key	text_key	Description	Used In (effect file, *.tres)
additional_weapon_effects	effect_additional_weapon_bonus	Changes a stat (key) based on how many weapons you have	multitasker_effect_2 [effect_key]
alien_eyes	effect_alien_eyes	Only used by Alien Eyes	alien_eyes_effect_1
bounce	effect_bouncing	Adds bouncing to all projectiles	ricochet_effect_1
bounce_damage	none	Bounce damage. Can't exceed the base damage.	arms_dealer_effect_1b, engineer_effect_4, farmer_effect_4, one_arm_effect_2
burn_chance	effect_burn_chance	Chance to inflict burn. Needs a corresponding burning_data stats file	scared_sausage_effect_1
burning_cooldown_reduction	effect_burning_cooldown_reduction	Makes burning tick faster	eye_surgery_effect_1
burning_spread	effect_burning_spread	Makes burning spread to +x more enemies	snake_effect_1
can_attack_while_moving	effect_cant_attack_while_moving	Set to 0 to prevent attacks while moving	soldier_effect_5
cant_stop_moving	---	Set to 1 to stop the player from being able to stop moving	Unused, but appears to have some code that supports it.
chance_double_gold	effect_chance_double_gold	% chance to double materials when they're collected	metal_detector_effect_1
class_bonus_effect	effect_weapon_class_bonus	Grants a bonus to a specific stat (stat_name) when using a specific weapon class (weapon_class)	brawler_effect_1, crazy_effect_1, doctor_effect_1, ghost_effect_1, wildling_effect_1
consumable_heal	effect_consumable_heal	Increase HP gained from consumables	alien_worm_effect_2, lemonade_effect_1, weird_food_effect_1, chunky_effect_3, chopper_effect, chopper_4_effect
convert_stats_end_of_wave	effect_convert_stat_end_of_wave	Converts a stat (key) to another stat (to_stat) when a wave ends	demon_effect_1
destroy_weapons		Removes all held weapons when you enter a shop	arms_dealer_effect_3
diff_gold_drops	---	Appears to increase/decrease the chance for enemies to drop materials by %	Unused, but appears to have some code that supports it.
dmg_when_death_from_luck	effect_deal_dmg_when_death	% chance to deal a % of luck as damage, when an enemy dies	cyberball_effect_1
dmg_when_pickup_gold_from_luck	effect_deal_dmg_when_pickup_gold	% chance to deal a % of luck as damage, when you collect a material	baby_elephant_effect_1, lucky_effect_3
dodge_cap	effect_dodge_cap	Increases/decreases the dodge cap by a %	ghost_effect_3
double_boss	effect_double_boss	Makes 2 bosses spawn instead of 1	difficulty_5_effect_4
double_hp_regen	effect_double_hp_regen	Makes HP Regeneration trigger twice as often	doctor_effect_3
double_hp_regen_below_half_health	effect_double_hp_regen_below_half_health	Makes HP Regeneration trigger twice as often, when you're below 50% HP	potion_effect_1
enemy_gold_drops	effect_enemy_gold_drops	Change the amount of materials dropped by enemies. This is an int (eg -50), not a float (eg -0.5). See also: gold_drops, neutral_gold_drops	explorer_effect_8
enemy_speed	---	Change enemy movement speed
enemy_strength	effect_stronger_enemies	Affects both enemy HP, and the damage they deal	difficulty_3_effect_2, difficulty_4_effect_2, difficulty_5_effect_2
explode_on_death	effect_explode_on_death	% chance for enemies to explode on death. Needs a corresponding weapon_stats file	rip_and_tear_effect_1
explode_on_hit	effect_explode_on_hit	% chance to explode when you take damage	bull_effect_4
explosion_damage	none	Increases explosion damage	dynamite_effect_1, explosive_shells_effect_1, etc
explosion_size	none	Increases explosion size	plastic_explosive_effect_1, artificer_effect_1b
free_rerolls	effect_free_shop_reroll	Adds free rerolls. Can't be negative	dangerous_bunny_effect_0
gain_bounce_damage		Used by get_stat_gain, which converts an int (eg 20) to a float (eg 0.2) and adds it to the stat. Seems to be unused.	See RunData.effects["gain_" + stat]
gain_explosion_damage
gain_piercing_damage
gain_pct_gold_start_wave	effect_gain_pct_gold_start_wave	Gain/lose +x% of your materials when a wave starts.	piggy_bank_effect_1
gold_drops	effect_enemy_gold_drops	Changes % of dropped materials. Int, not a float. See also: enemy_gold_drops; neutral_gold_drops	explorer_effect_8, farmer_effect_3, streamer_effect_2b
gold_on_crit_kill	effect_gold_on_crit_kill	Gain materials when you score a crit	hunting_trophy_effect_1, dagger_effect
group_structures	effect_group_structures	Makes structures (mines/turrets) spawn closely grouped together	engineer_effect_3
harvesting_growth	effect_harvesting_growth	Increase/decrease the % Harvesting growth. Without items it's 5% at the end of each wave. Farmer has +5, Crown has +8.	crown_effect_1, farmer_effect_2
heal_when_pickup_gold	effect_heal_when_pickup_gold	% chance to heal 1HP when you pick up materials. Can't change the healed amount, only the chance	cute_monkey_effect_1
hp_cap	effect_hp_cap_at_current_value	Changes the Max HP cap. Default is 999999. Use set_cap_to_current_max_hp=true to cap at current.	handcuffs_effect_4
hp_shop	effect_hp_shop	Changes shop items to cost Max HP, instead of materials	demon_effect_2
hp_start_next_wave	effect_hp_start_next_wave	Start the next wave with % less HP. Int, not float.	weird_ghost_effect_2
hp_start_wave	effect_start_wave_less_hp	Start ALL waves with % less HP. Int, not float.	sad_tomato_effect_2
inflation	---	Increases the cost of items (even more), based on the current wave. Inflation was removed. It was part of the original demo.
instant_gold_attracting	effect_instant_gold_attracting	% chance to attract dropped materials	baby_gecko_effect_1, sifds_relic_effect_1
item_box_gold	effect_item_box_gold	+x materials when you pick up a Crate	bag_effect_1
items_price	none	Change shop item costs by x%	coupon_effect_1, entrepreneur_effect_0, mutant_effect_2, saver_effect_4
knockback	effect_knockback	Add/reduce knockback for all weapons by x	boxing_glove_effect_1
lose_hp_per_second	effect_lose_hp_per_second	HP is reduced by -x every second	blood_donation_effect_2, sick_effect_3
map_size	none	Increase/decrease the map size by x%	explorer_effect_6, old_effect_3
max_melee_weapons	effect_generalist	Set the max number of held melee weapons to x	generalist_effect_3
max_ranged_weapons	[EMPTY]	Set the max number of held ranged weapons to x	generalist_effect_4
max_weapon_tier	effect_max_weapon_tier		wildling_effect_3
min_weapon_tier	effect_min_weapon_tier		knight_effect_4
neutral_gold_drops	none	Increases materials from EntityType.NEUTRAL by +x% (ie. trees) See also: gold_drops; enemy_gold_drops	Unused, but appears to have some code that supports it.
no_melee_weapons	effect_no_melee_weapons	Stops melee weapons appearing in the shop. Doesn't remove weapons that are already held.	ranger_effect_5
no_min_range	none	If 1, the min_range of a weapon is used. Useless in vanilla because all weapons have a min_range of 0.	Unused, but appears to have some code that supports it.
no_ranged_weapons	effect_no_ranged_weapons	Stops ranged weapons appearing in the shop. Doesn't remove weapons that are already held.	gladiator_effect_3, knight_effect_3
number_of_enemies	none	Increase/decrease the number of enemies that spawn, when a group of them spawns	candle_effect_3, gentle_alien_effect_2, mouse_effect_2, white_flag_effect_2, explorer_effect_7, loud_effect_2, old_effect_4
one_shot_trees	effect_one_shot_trees	Makes trees get destroyed in 1 hit	lumberjack_shirt_effect_1
pacifist	effect_pacifist	Gain x% materials and XP per living enemy when a wave ends. No effect if 0 or below.	pacifist_effect_2
pickup_range	effect_pickup_range	Change pickup range by x%	alien_tongue_effect_1, gnome_effect_4, little_frog_effect_1, explorer_effect_4, soldier_effect_3
piercing	effect_piercing	Adds +1 piercing to all projectiles	bandana_effect_1
piercing_damage	effect_piercing_damage	Bounce damage. Can't exceed the base damage.	pumpkin_effect_1, arms_dealer_effect_1b, engineer_effect_4, farmer_effect_4, one_arm_effect_2
projectiles_on_death	effect_projectiles_on_death		baby_with_a_beard_effect_1
recycling_gains	effect_recycling_gains		recycling_machine_effect_1, entrepreneur_effect_2
remove_speed	effect_remove_speed		ugly_tooth_effect_1
starting_item	effect_starting_item		many characters, too many to list
stat_links	n/a		seems to be used by gain_stat_for_every_stat_effect.gd
stats_end_of_wave	effect_gain_stat_end_of_wave		grinds_magical_leaf_effect (all 3), vigilante_ring_effect_1
structures	n/a		via: structure_effect via: gain_stat_for_every_stat_effect
temp_stats_on_hit	effect_on_hit		triangle_of_power_effect_3, masochist_effect_1
temp_stats_stacking	effect_stack_stat		wisdom_effect_1
temp_stats_while_not_moving	effect_stat_while_not_moving		barricade_effect_1, chameleon_effect_1, statue_effect_1, soldier_effect_1, soldier_effect_2, speedy_effect_3, streamer_effect_1
torture	effect_torture		torture_effect_2
trees	effect_trees		tree_effect_1, explorer_effect_1
trees_start_wave	[EMPTY]		explorer_effect_11
unique_weapon_effects	effect_unique_weapon_bonus		focus_effect_2, spider_effect_2
weapon_bonus	effect_additional_weapon_bonus	Gain stats based on the number of weapons you currently hold	focus_effect_2, spider_effect_2, gladiator_effect_1, multitasker_effect_2
weapon_class_bonus	n/a	Gain bonus stats based on the number of held weapons in the specified class	brawler_effect_1, crazy_effect_1, doctor_effect_1, ghost_effect_1, wildling_effect_1 see: effect_weapon_class_bonus
weapon_slot	effect_no_weapons effect_max_weapons	Set the number of weapon slots to x	bull, multitasker, one arm
xp_gain	none	Increase/decrease XP gain by x%	bean_teacher_effect_1, black_belt_effect_1, diploma_effect_2, scar_effect_1 mutant_effect_1

Note: These effects are listed in run_data, but don't do anything: gambler, leave_burning, wandering_bots.

Added in v0.6.1.6

• double_hp_regen_below_half_health
• hit_protection
• minimum_weapons_in_shop
• percent_materials (only works with temp_stats_while_not_moving)
• temp_stats_while_moving
• upgrade_random_weapon
• weapons_price