The Greek Underworld, by Lokai-

This self-contained dungeon system was built by a freeshard community member, Lokai. Alterations and minor improvements were made to fit better on The Expanse. Players must kill a certain number of enemies per round to summon each boss. After that, as each boss is defeated, players progress further into the dungeon, until they eventually face off against Hades and Persephone.

The Greek Underworld by Lokai
(Thumbnail caption: Players must defeat a certain number of enemies to advance into the dungeon.)