Crawler

Crawlers are suicide troops employed by the Planet Eaters, used to clear out targets and sections of city with their self-destructive explosive attacks.

Lore
Crawlers are bug-like monsters whose saliva can melt earth and stone, and they are able to swim through the molten sludge they create. Suicidal and disposable, they retaliate to attack by exploding in a blaze of plasma energy, obliterating everything around them.