Just beat him on my 2nd try, after 9 left on my first. Once again, I used an elf paladin with a dragon shield.
My most important buy was a second schaudenfaud potion which was incredibly important. Fought at level 6 and leveled up to level 7, and used only two undead heals. The most scary moment was when I could not sustain another hit from the indomitable and he had no protections left. Fortunately, Dracul was there to save the day with a last minute blood swell.
Since I'm interested to see other peoples strategies please post how you beat it.
Also, I have finally beaten every quest and dungeon at least once!!!!!!!!
We made an expansion and it is awesome. Really, you should check it out, especially if you're looking for some extra challenge.
Download over at ddmod.weebly.com!