[Snake]

Checkmate should probably have something extra attached to it to justify the 3 turn CD, like Knockdown if you're using Heavy Armor, and maybe a long-term Interference (7 rounds at max rank) if done when the enemy is below a certain health threshold, to give the feel of 'You won't be getting back after that, boy'.

The Sudden Death and Zugzwang is so Black Knight has things to spend points on, to be honest. They don't have a lot of interesting skills, aside the offensive ones. The defensive ones are only bad because the enemy can simply re-inflict you with whatever status effect you cleansed, which is dumb, because you need to be using momentum that you can't spare all the time.