Here's the thing; I'd love to make a buffing build, but the other party members are evil and have displayed a tendency towards Chaotic Stupid, and I need to be able to take on likely 3 of them, possibly 4, if it comes to that.
So far, they are a Paladin of Slaughter, a Rogue, and another cleric. However, I have suggested that the Paladin take the Blackguard class and the Cleric take the Death and Destruction domain in order to lower their power level while appearing to be helpful. The Rogue plans on going into Assassin and using Death Attack, but at the same time does not consider himself to be a combat specialist and has geared himself towards social encounters - doesn't even have ranks in UMD or Tumble.
I figure the most trouble I will have is with the Psion, who I have given actual optimization advice to, but he seems to be neutral and friendly with me in game and IRL, so I might be able to expect him as an ally should I lay the smack down on the rest of the party.