The “Mischievous Hands” set.

That is, theoretically it could be:
5. Minotaurs
6. Nagas
7. Angels
8. Angels of the eighth level?
It's all serious.

No! I can recruit level 8 units in the city.

For example:
5. Tank (Fortress)
6. Unicorn (Rampart)
7. Beholder (Haven, Upper Nighon (I'll post it later))
8. Vasinka (Meow-city)