Decrepit Sewers Key Guardians are a melee enemy that follow the player and try to damage them by coming into contact with them. On death, they are replaced by their next phase. Each phase is weaker but quicker than the last. After their final phase, they are replaced by a Scared Skeleton.
Decrepit Sewers Key Guardians can appear in multiple locations, including the Emerald Trail, Coastal Trail, Nivla Woods, and near the Decrepit Sewers itself. They spawn less frequently compared to other mobs.