Barrow Wight (Conj 4, requires 2D1S costing 10 death gems for now; the magic paths available to it are 1D1S +100% WDSB, so one in four can recast the summoning spell):
So far, they've been quite capable thugs in my tests. Magic duel will bring them down right quick, though.
And, with that, I'll be updating the download to include the three spells I've added as well as some of the balance changes people have suggested and I've made.
The three spells are:
Command the Pit - 6 blood slaves for 12 snaga goblins.
Raise Barrow Wight - 10 death gems for 1 barrow wight commander.
Enrage Uruloki - 15 fire gems for a remote attack of a huge dragon that flies off after it fights. I haven't posted stats for the dragon because I don't have an original sprite for it for now. I'm using the red dragon pretender sprite.