Is it 8?
I’ve seen some site say 10 but all the skill grids I see (they only go up to around level 25 though) show 8. I’ve even seen one site (IGN) that says you can have 20 skeletons and 20 mages but I know that’s wrong.
The first 3 pts give 1 skelly per pt, then every 3 pts after that you get another. There is no max.
I am currently running lvl 30 mages and I have 12, My ‘dream’ gear would be at lvl 45 mages that’s 17.
21 is the max number