Skelemancer class

Skelemancer class
MU variant. Can animate one humanoid skeleton per day at first level (progresses like MUs’ spell memorization). But can only control (wis +- d6) skeletons at a time (skeletons check for obedience once at creation, then again at first combat, then every d20 days).
How should their abilities increase with level? I think a Zak Smith type d20 table that you roll on when you level up.
1. skeleton does not have to be cleaned/enchanted before animation (ie make zombies)
2. may make more dangerous skeletons from more dangerous/bigger critters (bears, tigers, dinosaurs, thoats, dragons)
3….?