Level 8?! The boss is a joke. You can get the kill earlier. I'll make a vid of it (it's one of my favorite challenges too). The key to sillyname, which everyone should use, is ENDISWALL for 65% res on the first, then potions for more stoneskin, and GETINDARE for the kill. You can fight the weakening ones. Trust me, you'll live. Also, for the first level, if you can find an attack booster, kill two spellslingers (level one, of course) to level.
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!