Boomer

Boomer is a bloated, drowned-looking Sewers and Lab enemy whose melee attack pushes its target one tile. Its signature trait is an explosive death: when defeated it detonates in a 3x3 area, dealing damage and knocking back all nearby units two tiles. This makes its death a potential tactical tool — positioning Boomer near grouped enemies before finishing it can chain damage across the field. It leaves no corpse after the explosion.