Acererak 19
Asmodeus 20+1=21 is a bad ass that has been ruling bad ass forever
Demogorgon 28
Graz'zt 21
Iggwilv 13
Iuz 25
King Snurre 17
Lord Soth 25
Szass Tam 13
Tharizdun 25
Tiamat 25
Venger 16
Vlaakith 14
Xanathar 11-2=9 rules a thieves guild
Zargon 19
