Knight's abilities need a buff
As it stands, this ability restores 3 HP a sec over 25 seconds, meaning... 75 HP total. Worse, this ability does NOT stack when multiple knights in a group use it. So it's basically a useless waste of stamina. Heal is also like this-- it restores 1000 HP over time, again, not really useful considering the stamina useage.
You're far better off using your commander to heal instead.