Chem

Mixes fire, frost, shock and acid into worse things.

Skills

Passive

Catalyst

+15% Element Potency
+6% Element Chance
+25% Acid Potency
+1 Grenade
+50% Combo Damage
+50% Acid Duration

Skill 1

Acid Grenade

Cooldown 9 s

40 Damage
3.5 m Radius
4 s Acid Duration
Acid eats armor

Skill 2

Gas Cloud

Cooldown 18 s

5 m Radius
8 s Duration
-30% Zombie Speed inside
Zombies avoid it
Fire ignites it

Ultimate

Incendiary Sprayer

9 m Range
8 s Duration
Ignites gas

Augments

Name	Skill	Effect	Unlock
Volatile Mix	Acid Grenade	Grenade also leaves fire for 4 s -20% Acid Damage	Level 10
Corrosive Rain	Gas Cloud	Cloud burns with acid instead of slowing	Level 20
Napalm	Incendiary Sprayer	Spray leaves burning pools +4 s Duration	Level 30
Chain Reaction	Acid Grenade	Acid kills burst into pools Max 3 in a row -15% Radius	Prestige 1

Skill tree

Corrosive

Name	Tier	Effect	Max rank	Cost
Etching	1	+8% Acid Potency per rank +6% Damage to acid-burnt zombies per rank	5	2
Wide Splash	2	+0.5 m Acid Grenade Radius per rank	3	2
To The Bone	3	x1.5 / x2 / x3 Acid Damage to legs by rank Legs melted to 0 fall off	3	3
Sinkhole	4	+2 s Acid Grenade Duration per rank -40% Zombie Speed in the acid Digs a pit on sand	3	3
Universal Solvent	5	+1 Acid Grenade Charge Acid eats through walls it splashes	1	6

Gas

Name	Tier	Effect	Max rank	Cost
Volatile Primers	1	+4% Element Chance per rank A failed roll can still apply acid at half the chance	5	2
Rime Fog	2	+1.5 s Gas Cloud Duration per rank Zombies inside freeze after 6 / 4 / 3 s by rank	3	2
Charged Mist	3	+0.75 m Gas Cloud Radius per rank Shocks the zombie deepest inside every 2 / 1.5 / 1 s by rank	3	3
Chokehold	4	Zombies coughing in Gas Cloud lose attacks for 0.3 / 0.4 / 0.5 s by rank	3	3
Thermobaric	5	-25% Gas Cloud Cooldown Your fire detonates the cloud after 2 s Up to 270 Damage in 4 m Breaks walls	1	6

Incendiary

Name	Tier	Effect	Max rank	Cost
White Phosphorus	1	+8% Fire Potency per rank	5	2
Pitch And Tar	2	Zombies tearing your repaired boards catch fire every 3 / 2 / 1 s by rank	3	2
Pressure Nozzle	3	+1.5 m Incendiary Sprayer Range per rank +1 s Incendiary Sprayer Duration per rank	3	3
Pyre	4	Burning kills leave 1.2 m of fire +1.5 s Pyre Duration per rank	3	3
Brushfire	5	-20% Incendiary Sprayer Charge Cost Burning zombies ignite the 2 nearest within 1.5 m	1	6

Pictures

Acid Grenade — Acid GrenadeA burst of acid that leaves the floor burning.

Gas Cloud — Gas CloudA slowing cloud; set it alight for worse.

Incendiary Sprayer (Ultimate) — Incendiary Sprayer (Ultimate)Eight seconds of flame, nine metres long.