Modifiers

Bosses and levels can have modifiers that change aspects of gameplay.

Boss modifiers

Bosses can spawn with multiple modifiers (for example, "cloned burning dwarf champion")

Name	Description
Cloned	Two of the boss spawn. Both must be killed and they have less health.
Lethal	Deals more damage. Uses special attacks much more frequently.
Dwarf	Boss has a smaller model and moves faster.
Poisonous	Attacks inflict damage over time.
Cosmic	?
Crazed	?
Champion	Doubled HP^{[verification needed • edit • ?]}
Hidden	Boss is mostly invisible (can just barely see them).
Electric	Boss has an electric field surrounding them, lightning bolts occasionally fall from the sky.
Burning	Boss has a fiery aura that damages the player if they get too close.
Giant	Boss is physically bigger and has a larger health pool.
Vengeful	Boss shoots projectiles back at you when you damage them.
Twin	There are two bosses, but they share a health pool. This is different from Cloned.

Name	Description
Dark	The level is darker and the player must navigate with a flashlight.
Castle	A rare parkour-orientated room can spawn, at the end of the room is a weapon box and a enemy who fires beams at the player as they traverse the parkour. Guardian enemies as well as clockwork enemies are much more likely to spawn.
Glass	The player and enemies take double damage.
Midas	Every enemy drops a coin. Keys and potions are replaced by coins. Mini-Bosses and Bosses drops multiple coins instead of a key.
Inverted	The player camera is flipped vertically. Can only occur at Asgard I.
Barren	Enemies do not drop coins and reward chests do not spawn.
Infested	More enemies spawn.
Frozen	The whole level is ice causing the player to slide about.
Space	Gravity is reduced.
Explosive	Enemies drop skulls on death, which explode and cause AoE damage to other enemies. The skull will replace enemy natural gold and key drops (including boss key drops).
Pitted	The level has a unique room, where you have to complete a (simple) jumping puzzle in order to exit.
Retro	Your screen becomes highly pixelated, and your weapon model centres on the screen like in DOOM. Note: this modifier is Challenge specific and does not occur in normal runs.