In the end, Michael was fortunate to fill all his contract slots with just five black apes.
The remaining three corpses could still be used for {Undead Revival}.
Michael decided that after advancing in rank, he'd attempt to use them as materials to create undead.
Additionally, he planned to sell the goblin corpses he had stored in his mark of origin—those that had failed to revive as undead and could no longer be used for crafting new undead—at the association tomorrow when he checked if the receptionist had managed to secure him a crack entry.
Now, Michael had a plan.
Initially, after filling his contract slots, he intended to begin evolving his undead, but then he remembered something important.
The higher the rank of the undead, the more likely it was for the {Undead Summoning} skill to fail.