Lawbringer takes 0 skill, so idk why that's winning. None of the Knights take that much skill tbh, but gladiator would probably be the hardest to master.

I've found Gladiator does, lowest health of the knights and you have to be extremely agile to use him. Lawbringer is easy for me, but that may be because he's just become second nature for me. Conqueror takes no skill, along with Centurion Peacekeeper is more on the easy side, she's not too hard, but not too easy. Warden is easy. That's the first person you have unlocked for knights, and is pretty easy to get down.

Hard to say really. Mostly depends on the player and their style. I don’t think there really is any hero in the game that “takes the most skill to use”. And there aren’t any heroes that are just universally easy and take “no skill” to use. Also, the Conqueror being in serious need of a rework doesn’t necessarily mean it would take the most skill to use, especially if you know how to utilize it’s little “quirks” to your advantage :3

I main a peacekeeper, and I think that is hardest one out of those to master, although I haven't really played with the centurion or gladiator in a PVP match yet.