Meritous

From the Orcus Dome flows the mysterious energy that PSI users rely on for their powers. But one day, things take a turn for the worse, and the energy seems disrupted. You play as Merit, a PSI user who takes it upon himself to go investigate the problem.

In Meritous, you control this character through a gigantic map made up of 3,000 randomly-placed interconnected rooms, populated with thousands upon thousands of monsters, along with a few bosses. Your goal is to gather the PSI artefacts and restore order to this sprawling underground maze. You are armed with nothing more than your PSI abilities, that can be upgraded with crystals obtained from slain monsters, and you will find items to aid you in your quest.