This is the Knight Class Tree, that I made, from a section of the Hero Guide over at the community discord. Decided to post the image here, for those who don’t have discord and just want to know the Knight information.
This is my opinion:
At this moment, in order of strength for Arena.
Sacrifice: Combine with Priest or not to protect the fragile heroes.
Renew: Shines best with Priest but still useful to live longer.
Judgement: Attempts to make knight deal more damage, unimpressed.
Honor: Only works on normal attacks, very unimpressed.