Grimmaw is a Unique Phasebeast found in the Tower of the Damned Level 2 in Act III of Diablo III. In Reaper of Souls beta it was notable for dropping the Demon Skin.
This monster does not appear in the released version of the game due to a bug, but as it does not participate in any achievements, this does not affect the gameplay.
Trivia
- A rare monster with the same name exists in World of Warcraft.