Gasser

Gasser is a 15 HP enemy that makes the battlefield itself a threat. Its SpawnGas attack creates poisonous gas clouds on adjacent tiles, building up environmental hazards that persist and damage any unit walking through them. Its GasserExplode spell triggers a large detonation that deals significant area damage and likely converts the gas it has already produced into an amplified blast radius.

The combination of gas spawning and self-detonation means Gasser is both a prolonged terrain hazard and a ticking bomb. Even if your cats successfully avoid its initial gas clouds, the explosion can catch multiple units in a wide area. In encounters with multiple Gassers, gas clouds can rapidly blanket the battlefield, severely limiting movement options.

Kill Gasser before it can accumulate gas clouds and before it reaches the threshold to detonate. At 15 HP it is not particularly durable, so burst damage from ranged attacks eliminates it cleanly without triggering a death explosion. Avoid clustering cats in areas where it has already spawned gas. Poison resistance reduces the gas cloud damage passively, making it more comfortable to navigate terrain that already has coverage.