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OK, then I'll share my point of view too!!! I'll focus on the stats, not on the fact that there are many skeletons – that's obvious to everyone.
1st level – Assassin, I don't think I need to explain why.
2nd level – Fury, I won't explain this either; I hope it's clear.
3rd level – Master Archer, due to the damage and initiative reduction.
4th level – Vampire Lord, well, what can you do? I don't even need to cast Raise Dead on them; I almost never lose them.
5th level – Let me think, who's even available there? Well, Lich or Hydra, but I still prefer Hydras.
6th level – Paladin, right off the bat.
7th level – Something from the high tower against black dragons, but maybe I just like