This is wierd... I accidentaly said no to sarevok when he asked to join so he went away then I clua-ed him back in ,he joined but he now looks like he did before I gave him a piece of me and has a permenant ring that (i think) sets his ac at -23 (armor or ring of protection don't change his ac) is this like a problem to the rest of the game?
"affects intelligence in a negative matter duhh i think..."
Don't know why he's got this ring, but if you play it normally, he doesn't have it. You might want to load up a savegame and start over, saying the right things to Sarevok this time.