Quote Originally Posted by Fax Celestis View Post
The -Wis is due to not many drow entering into priestly or druidic roles, while the +Cha is due to their natural predilection towards spontaneous magics. Also, the -Wis is to make the total ability modifiers into a +0, so that I can feel a little bit better about giving an LA +0 race spell resistance.
Favoured class is cleric/wizard, so if anything, the WIS and CHA modifiers should be switched.