A dog-sized crab with a square-shaped reddish-brown carapace covered with dark red and yellow markings scuttles forth, pincers raised. Tiny flames lick its body, erupting at irregular intervals from its underbelly. Its eyes are perched on the end of two large eyestalks that protrude from the center of the carapace.
Fire crabs are highly territorial and defend their lair with great ferocity. Normally non-aggressive creatures, if their lair is threatened, they fight to the death. Against weaker prey, fire crabs usually just slash with their claws. Stronger foes are grabbed and squeezed by the fire crab. Once they grab an opponent, they hold on, allowing their fires to engulf the foe.
The body of a lesser fire crab generates intense heat, dealing 1d4 points of fire damage with its touch. Creatures attacking a fire crab unarmed or with natural weapons take fire damage each time their attacks hit. Any melee hit by a fire crab deals fire damage.