Jewelhammer's Vault is a titan observatory located underneath Alcaz Island in Dustwallow Marsh. The entrance is underwater at . It is here that a Vault Guardian guards the Jewelhammer's Chest, which contains .
- The layout for the cave and the observatory is an exact copy of the Primordial Observatory, although the observatory segment itself is not unique.
- Patch 8.0.1 (2018-07-17): Added.