Catacomb II

You, Petton Everhail, have been hired to recover fantastic treasures deeply buried in the ruins of the Kieralon Palace. Even as the world's most powerful magician, the path to the treasure is dangerous, wandering, and full of monsters. Explore the ruins and use your magical powers to fight enemies, and discover hidden passages.

Catacomb II (later renamed The Catacomb) doesn't stray from its predecessor in the series but does offer an additional 30 levels to explore.