[Taqwus]

For other paths, look at Summon Lamia Queen (takes nature, gets D2/N1/?1/?1 with the ? restricted to sorcery) and Summon Couatl (gets nature/astral/holy, don't remember how much). Black Sorcerors also have an unrestricted random, if memory serves, but that's capital-only and not terribly cheap. Death will get you Summon Spectres, who are D1/1?/1?.
Oh, and don't forget that undead commanders can still use Fever Fetishes to produce fire gems even 'tho they don't suffer from them. Could boost your economy if you abuse 'em and put them on Mound Kings, Revenants etc.