I just cleared out a monster zoo using primarily nightmare curse. While fighting the monsters, my max mana changed quite a bit, going down to 0, and eventually increasing to about 200. After the battle, I looked at my character screen, and noticed that my sagacity, magic power, and mana regen had increased by a lot: http://cloud.steampowered.com/ugc/558663568028658818/449579605ACCD15B31C016FD39BF90094A7F183C/ . I'm not complaining about this development, but I doubt it was supposed to happen. My skills are Necronomiconomics/mathemagic/blood magic/ burglary/unarmed/alchemy/artful dodger, with level 3 in alchemy, level 3 in blood magic, level 2 in Necronomiconomics, and level 2 in artful dodger.