Beat him at Level 8 (Hard) with Mage and Rogue with Lone Wolf.
- Have your characters stand back to either side of the doorway (bosses can only fit 1-2 at a time through there).
- Have a character with at least 6 starting AP talk to Braccus Rex.
- Right before you end the conversation, have someone cast invisibility on the character talking to Braccus Rex.
- Fight starts, nobody gets hit with meteor. Pyramid back to doorway. Bosses start rushing the door.
- Let them pile up in the doorway, and slam them with ridiculous amounts of AOE.
If you use a lot of ice, you can even kill the twins then teleport some of the bosses into the lava! HAH!