Just beat No Heart.
Holy fucking shit
I thought I knew what I was getting into going into this. I figured he'd be like how he was in the PSP version, but just with some nerfed stats, and a slightly more aggressive AI. I just played a goddamn episode of Dragon Ball Z. He's no Lingering Will, but this new rebalanced No Heart might just be one of the most bonkers KH bosses I've ever fought. First off, they weren't kidding about the speed increase. Dude moves around like he's on crack. The video of the player beating him at level 1 isn't too indicative of how a typical battle will go with him because the player was on the defensive most of the time, being at level 1 and all. But if you're adequately leveled and can take and dish out powerful hits, it's a whole new ballgame.
Let me just give you an example of an occurrence during the battle: I go for a physical melee strike, he reverse slides behind me and goes for a keyblade combo, I use Aqua's Teleport ability to warp behind him and go for a Thunder Surge, which he promptly blocks and counters with his punch/kick melee string. I manage to block the inital 3-4 hits, and teleport behind him as he delivers the last kick and get in a few good hits before he slides behind me again and lays down a Slow/Haste barrier right as Aqua goes into the Ghost Drive style. Now see, the way that Slow/Haste barrier works is that he'll create a cylindrical barrier on the battlefield. If you end up in it, you'll randomly be afflicted with either Slow, or Haste, which is actually beneficial. Luckily, I got haste, which meant that I could move every bit as fast as he could now. So the next 30 or so seconds consisted of both Aqua and No Heart more or less flying all over the place dealing damage to each other so fast that I couldn't even follow what was going on for a bit. None of what I just typed was scripted. It just naturally occurred during the fight.
It's overwhelming in the best way possible. I don't think there's a single boss fight in the entire series that has so much going on at once and so much stuff being thrown at you while still not feeling cheap at all.
Holy shit. I need to go to bed after that.