I can barely get a hit on this guy! My skills are Fire Magic Viking Magic Sword Dodging Crits Blood Mage and rage I have a holy hand grenade but it barely hurts him. What am I doing wrong?
A crossbow with +aethereal or +righteous damage is a dredmor killer. But apart from that - your build has really speaking, no synergy. When in doubt however just chuck clockwork sawblades on his head until he drops.
If you've capped the Viking Magic tree and have decent Magic Power/Savvy, giving Dredmor a taste of his own medicine in the form of spamming Thor's Fulminaric Bolt might not be bad, but I've never tried it myself. Promethean will be useless, though - most of its damage comes from dropping flame feilds and pillars of fire all over the place, which are all Damage Over Time effects, and Dredmor has enough fire resist to mostly neutralize those. Do you have capped block and good AA? Are you wielding a Chest of Evil Monofilament Sword? You might be able to melee his face in, but you'd better have stockpiled a lot of healing potions, fairywodgers, greedy blungecaps and Invis Potions/Inky Hoglanterns, and it WILL take ages. Holy Hand Grenades deal about 60 damage to everything in their area - but Dredmor has hundreds of hitpoints. If you go and buy out all the grenades from throw vending machines from DLs 11 to 15, you might have a shot.