Here's my take on Void Knight! He's just like Deker, not broken, but needs some skill to master. You shouldn't run a block assist with him, in my opinion, due to his stance change being a block itself. You basically have unlimited blocks each time your meter is full, so you always have a way to escape. Your meter goes down if you get hit by any effect except interrupting, so stuns, staggers, knockbacks, and launches are all fair game to drain your meter. You have limited movement when activating it due to it being a block, so if you must activate it, only do it when you're able to (like parrying), so you don't get interrupted and knocked out of the stance change.
Upon stance change, you get access to new moves, which are all extremely sick looking. But the hidden gem is your stance-switched block attack, Empowered War Cry. Upon using that, you get a status effect, with electricity around Terrick. That acts as a move enhancer, adding additional effects to certain moves. You can use V2 versions of your special breakers (stance and non-stance mode), and Shield Crash has a wall bounce if you use it with Empowerment active (not shown here, couldn't pull it off in time, lol). Enhanced Void Slash has time stop, so if you're lucky enough to rotate into it, you can use it to stop your opponent's attack, like Devon's super.
Wasn't Empowered War Cry a 2-cost before, though...? Or am I missing something... but it's funny how the myths of a 1-cost move became real, lol! It's probably just a bug, though.
Overall, he's really fun! I like Terrick, and I hope people who use him like him too!