An accomplished mage himself, Grelminar specializes in teleportation and cross-planar magick, and Nemesis was intending to use his abilities to finally defeat his rival and remove any remaining obstacles to his evil reign. The Gates that Petton encounters throughout Catacomb 3D are due to Nemesis harnessing Grelminar's abilities, which he's done by sealing Grelminar in an amber coffin and siphoning off his power.
Grelminar is found in the final level of Catacomb 3D, Nemesis's Lair, after vanquishing the evil lich. He is hidden in Nemesis' workshop, which is hidden behind the throne in the final boss room. Touching the capsule breaks it open and wins the game.
- Nemesis and Grelminar's names were accidentally switched prior to release; in the Gamer's Edge versions, Greliminar is called Nemesis and vice-versa in all in-game materials. This resulted in considerable confusion for players in the 90s who played the later Catacomb Adventure Series after playing the Gamer's Edge version of Catacomb 3D.
- The theme of teleportation would later be used for the teleporters to Hell in id Software's Doom and the slipgates in Quake, as well as the similar portals to Xen in Valve Software's Half-Life.
|Characters:||Petton Everhail - Grelminar - Nemesis|
|Enemies:||Orcs - Trolls - Bats - Mages - Demons - Fireballs|
|Items:||Magick Missile - Cure Potions - Treasure Chests - Keys - Bolts - Nukes - Scrolls - Gates|