Dungeons and Dragons Wiki
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so you give them a negative level with every hit you do as a unarmed strike? what is the save? you said charisma based but what (HD+Cha) (1/2HD + Cha)(10 + 1/2HD + Cha) do the temporary hit points stack with other temporary hits points? --Kojopo 13:02, September 18, 2010 (UTC)

Yeah, it does deal a negative level with each one. It's a Frank & K feat, which means the authors are not participants on this Wiki per se. In my experience, the assumption that they work with is that saves from feats use the standard 10 + 1/2 HD + ability mod unless explicitly stated otherwise. Plus, the fact that temporary hit points are added each time you drain seems to imply that they stack. I know you are talking about stacking with other sources of temporary hp, but I think that's another thing that the authors pretty much took for granted here. In a Wizard-level game like the ones this was meant to be used with, I think such things are basically given. - TG Cid 13:48, September 18, 2010 (UTC)
Were a monk to use this, it would be scary.--May the true lore ever be protected and Kept in the mighty tomes. 16:21, September 18, 2010 (UTC)
Again, wizard-level stuff is supposed to do crazy things. It was probably meant to be used with this monk anyway since it's a Tome feat, but given what that monk can already do it's not necessarily a huge upgrade. - TG Cid 18:08, September 18, 2010 (UTC)
@Cid: That's impossible, as the Dungeonomicon (where the Monk was introduced) came out two books AFTER the Tome of Necromancy (where this was introduced). Said Monk couldn't have been a consideration when making the feat.
The rules for Negative Levels are [Drain, Negative Levels, and Level Loss#Negative_Levels|here]. Note that the formula for the save DC is explicitly listed there; it is indeed Charisma-based, and follows the standard rules for Monster non-spell-like special abilities. I believe the default is that temp HP *don't* stack, but rather overlap - thus, the gaining temp HP every time you hit is just a formality. --Quantumboost 04:26, September 19, 2010 (UTC)