Mutators

Mutators are modifiers to enemies that spawn from that particular lane in the Onslaught game mode. These can be an advantage or disadvantage to the enemies or can grant additional effects. Double Mutators start at floor 22.

Name	Icon	Description	First Floor Found on	Counter
Headstrong		Enemies cannot be stunned.	Floor 3	Don't use stunning defenses on these lanes.
Pile it on		Enemies take increased damage per condition they are under	Floor 3	Use many different conditions from defenses and abilities.
Power Block		All enemies are immune to damage from Abilities, but take increased weapon damage	Floor 3	Don't use abilities.
Unstoppable		Enemies are immune to slow effects	Floor 3	Don't use slowing defenses on these lanes.
Abominable		Enemies inflict slow with their attacks	Floor 3	Avoid letting enemies hit defenses; slow or stun them.
Soft Spot		Enemies have increased resistance, but take extra weakpoint damage	Floor 3
Armored		Enemies take reduced Physical damage, and increased Magical damage	Floor 3	Use magic defenses (indicated by purple damage numbers)
Toxi-kaze		When Kobolds die, they will leave an area that deals damage to players inside	Floor 6	Rely on defenses to handle the lane.
Lethargic		Enemies start stronger, but get weaker the longer they live.	Floor 9	Keep your defenses towards the end of the lane.
Brittle		Enemies start with higher health, but receive a damage resistance debuff every time they are hit with hero abilities	Floor 9	Use your cheap hero abilities to weaken enemies.
Wall Leech		Enemies heal when damaging towers	Floor 10	Slow and stun enemies so they don't reach your blockades.
Maximum Effort		Enemies have more health, but get weaker with each unique source of damage that hits them	Floor 10	Stack many different defenses.
Phased		Enemies move slower, but they can phase through blockades	Floor 10	Slow and stun enemies to make up for a lack of viable blockades.
Proximity		The closer a source of damage is to an enemy the more damage it deals	Floor 10	Use traps and auras for close damage.
Long Shot		The farther a source of damage is to an enemy the more damage it deals	Floor 10	Use projectile defenses from far away.
Enraged		Enemies start weaker, but get stronger the longer they live	Floor 10	Place defenses at the beginning of lanes to kill quickly.
Cursi-Kaze		When Kobolds die, they will leave an area that debuff towers and defenses	Floor 13	Slow and stun kobolds so they don't make it to your last line of defenses.
Controlled Burn		Enemies can only be damaged while drenched, oiled, frozen, poisoned, chilled or stunned	Floor 20	Use defenses or abilities to apply one or more of the listed conditions.
Detonator		Enemies explode when killed	Floor 20	Keep defenses out of explosion-range and keep an eye on blockade health.
Bullet Sponge		Enemies have a small anti projectile shield	Floor 20	Use traps, auras, and anything else that doesn't shoot projectiles.
Pain Aura		Enemies deal damage around them	Floor 20	Keep defenses out of lanes so they don't take damage.
Spellbreaker		Enemies take reduced Magical damage, and increased Physical damage	Floor 20	Use physical defenses (indicated by white damage numbers)
Vampiric		Enemies heal when dealing damage	Floor 20	Rely on defenses to take out enemies; keep them away from blockades.