Grimm-Centinel

Centinels have long, black segmented bodies. Each segment has a pair of clawed legs and is covered by a protective shell. Their heads have no eyes but possess large jaws. Inside their jaws, they have four small claws. When injured, they sometimes "bleed" their bright green acid.

Centinels can burrow through rock and coil themselves together when attacking, moving at fast speeds. They can rotate their sections to burrow like a drill. Centinels can spit a bright green acid, which is able to corrode and melt through steel.

Centinels are described as not exactly being dangerous Grimm, thought they are annoying creatures to hunt down due to the sheer numbers they travel in, thus making Huntsmen avoid bounty missions on the Grimm, as a result making their rewards be disproportionately large compared to the difficulty ranking.