I don't know if this is a bug or not but I've been having trouble with it for a bit. I was on level 11 of Od Nua and suddenly Aloth's spells greyed out when I hovered the mouse over the spell level. The spells won't even come up when I do that now and when I try to equip a weapon or wand in one of his weapon sets, I get "that item cannot be used in this slot". Without Aloth I can't get very far because of his minor blights spell (which is very effective down there, and anywhere in the game for that matter). Hoping for a reply...