Only in 4e in the Default setting. He has nothing to do with the Abyss in other settings and Editions. He is just a scary imprisoned god of Entropy and Madness.
Acererak 5+1=6 Would have prefered some one else as the Winner but better him then Iggwilv or Tharizdun.
lggwilv 6 I mean, come on. She seduced and imprisoned Graz'zt. Tharizdun 4-2=2 Not a fan of him
After midnight post just to nuke Tharzidun! Tharzidun was more like a bad minion - the errand boy of the obyriths that went and messed everything up. You know, I actually liked the Dawn Pantheon and thought it was one of the best D&D pantheons. Of course, that's because they basically took all the high traction gods and threw them into one basket.