Abyssal Cove of the Ancients

Abyssal Cove of the Ancients is typically cleared only for the creation of Hephaestus Tokens. It's recommended to run the dungeon Hard Mode, so that the Chiton's Sigil has a chance to drop in addition to weapons.

The dungeon features a single miniboss that's found in the back-right corner from where you spawn. After that, you'll have to access a teleporter and make your way through a small maze-like section to reach the boss at the end.