The problem there is balance.

Which got me thinking about sorcery and those dang demon followers. Power requires sacrifice so how about when summoning demons, you give them ability points from your point pool of 60? Say…for every attribute point the follower get 100 HP, 20 Armor, 5% damage increase, and increased timer maximum by 5 minutes (still needs to be replenished by killing enemies).

For mounts, endurance total increase by 10, sprinting costs reduces by 0.2, and damage multiplier increases by 0.2.