Another thing to consider

Allowing us to change the allocation of the points gained per level.

E.g. If gree would allow us to gain 1 point per level between 100 and above but we could allocate to attack or defense, this would let us build different types of knights.

Some would add to attack and have killer attack, others to defense and become a tank etc

If this ability point was only for the main knight it would force the player to make decisions.