Oh I agree "Boss Killer" is not a particularly welcome designation on either side.  It is,  however,  what Methu was as he was originally built.  He wasn't exactly useless outside of that.  We are all flexible enough to do *something* most of the time.  Just Methu was very loaded on the very mechanics that made him "Boss Killer" if he couldn't level drain many he can't use a lot of other things.<br/><br/>Combat could get in a point where every major character is given  a bunch of extra hit dice advancement as a buffer and fighting them becomes us all trying to joust with a Methu shaped lance in order to bring it down to the point where we can affect it.<br/><br/>So I really like the suggested new versions.  I just asked you,  Lockepick,  a lot of questions because I want to help Methu be what you want him to be.  It looks like you are doing a good job . Methu is shaping up like a cross between the beguiler class and some type of berserker.  Plays up hedonism and trickery quite well.<br/><br/>A one round confusion aura that pierces immunity but gives them a +10 to the save *and* gives them immunity for four rounds on a successful save that a +10 extra for poison immunity is thematic but very unessessary.  The enemy effect won't end fights on it's own very often.  If you did want to add something more I'd say creatures that have both no int and no con score are immune.   On the rational that you are doing *something* to their minds or bodies.  Most immune to mind affecting creatures have minds that work very well,  some might not have brains but they do think.  A mind affecting immunity breaker makes a lot of sense even in a lore minded way.  Much like poison immune creatures have bodies with some sort of life to them.  There must be some things if put inside of them would be toxic.  No int and no con don't have that so if you want to be super in tune with the logic of the game world you could add that.  It's entirely undeeded from a balance point of view though.<br/><br/>The other quality is great and having some vile damage added seems cool.  On a full attack routine how much potential vile damage would this be?  Probably enough to be awesome not enough to be a problem.  I'm still curious.<br/><br/>One thing I am wondering is how did methu get the ability to make templates vampires with energy drain.  That can be houseruled in to vampires in general but technically those killed with a vampires energy drain are standard vampire spawn.  To make a real vampire they have to use blood drain.<br/><br/>Zaer has in the past allowed the Vampire template to be applied to more than humanoid and monstrous humanoid (+Dragon)  as it's limited to in 3.5. I would encourage you to try to establish with the DM what can become a vampire.  I thunk it might be best to establish a theme more than hard rules on creature types.   Much like I did with Phylactery Womb. Perhaps sime sembalance of humanoid features is required?  So Marilith might be in but Bebilith might be out.  - Then there is the question of what can be a vampire in general and how you might expand that further through your own abilities of you like.