With Thomas being located right next to a boneyard of mysterious creature X, perhaps a nice idea for his shop to start selling the gathered bones of those creatures. (As a summoning reagent)
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Another idea to slightly empower the Necromancers' would be that, that same mysterious creature X has about a 50% chance to 'drop' an item which resembles his corpse. Reckon 50% sounds right about fair, as you may accidentally damage the body in a way that it can't be animated without falling apart. Or something. The creature is rare enough, weights a ton, and will still overall be hard to kill when hunting it down on your own.
Basically just hoping for the corpse to become (even if slightly) more common. I could throw in the arguments that the art of animating is strictly forbidden, the corps weights a ton (45LBS?) and that it will generally take a hellutuva' effort to get one. Unless Thomas would sell them, at a price I expect to be at least several hundreds.
Thoughts?