R'lyeh Dreamlands and Void Summoning

[Cthuddha]

I've been itching to play as my favorite Lovecraftian race in this game, but I'm having some trouble with summoning monsters from the Void - my pretender, who is a Void Lurker, still manages to go insane after summoning something. I lost another pretender (also a Void Lurker) when he was "lost in time and space." What tips are there for summoning from the Void, and can I summon commanders via this method? My normal Illithids are going insane