I just beat Berserker Gold... without Whupaz. Elf Berserker. Preps: Battlemage Ring, Black Market, No church prep, Magnet: Fireball, Shield, Apothecary, Whupaz (Never got my hp high enough to take a hit), Schadenfreude, Reflex, and Transmutation Scroll. Just find MA, take consensus and mystic Balance ASAP. Proceed to level up without converting any glyphs. Take refreshment and two levels of magic, but make sure you have 40 piety for the boss. NOTE: There are no magic damage monsters and you will not physically attack the boss, so don't be afraid to fight Succubi and Steel Golems. For the boss, try to find some way to tank one shot and whupaz. It's not necessary, and I never did it, but it's super helpful. Take flames, and fireball the crap out of Antimony the Antizerker. I started at level 6 and killed him at level 7. Feel free to use health potions to scrape together a mid fight level up if you need them. Now I just need to beat Pally silver and (possibly) gold.
If you can beat The Undefeatable, you can DESTROY Eeblis.