The Chem Trooper was introduced in the 2.0 Patch along with other Poison-based units. At Rank 1, this unit has 210. Equipped with a Chemical Sprayer, the Chem Trooper attacks by dousing the 3 spaces in a row directly in front of it; dealing 45-75 damage (at Rank 1). Like most other chemical/poison-based attacks, its high damage will melt both troops and tanks along with its lethal Poison DoT () effect, which lasts for 3 turns unless the target(s) is/are immune to Poison.
However, the player should be very wary about deploying these troopers on the front-line due to their lack of Armor - their healing cost includes rare Chemical Vials. However, when used in PvP, this unit enters a two hour cooldown instead of going to the Hospital, so there is no Chemical Vial cost. Thus, it can see much more use in PvP.
The Chemical Trooper appears to have a cloud of chemical gas around its feet which, considering that the chemicals are supposed to burn through gas masks, probably isn't good.