So I'm thinking either some sort of soul cannon or other offensive weapon for the tower.<br/><br/>Something like the tower expends some number of stored soul HD and fires that many d10s of divine damage at something, anything killed by it is absorbed and has its body fell animated. I'm sort of heading towards a kind of crafter route eventually with soul powered devices and equipment, creating new types of undead, and so on. Less items so much as trying to use soul power to gain or use other abilities and make an army/siege weaponry sorts of things out of them.<br/><br/>My eventual plan is to use the 10th level mystic theurge power alongside a level of wizard and ultimate magus or cleric/true necromancer to get an obscene amount of casting and item creation/undead creation/soul power sort of thing going.