In my opinion, the best ability belongs to the Elves, and I would put the Warlock in second place. The Gnomes' super ability is somewhat similar to the Elves' ability, but with the opposite effect, while the Knight's ability doesn't appeal to me at all.
The Gnomes and Elves have abilities of equal strength. The only difference is that if my hero has 6 luck, meaning a 60% chance of a successful attack, compared to the Elves' 100% ability. Plus, my ability could be Fury of the Elements or Absolute Protection. Who benefits more from this?:)
As for the Knight's ability... I won't say anything, but I completely agree with you!:)
