Still interesting how he handled it. And given he didn't have a Keyblade in his hand, I'd almost mistake it for Anti-Form.
Maybe this is also how Drive forms would’ve been handled if Amano chose to adapt them.
Anywho, here’s the chapter rundown. After what is assumed to be a tiring climb for our heroes, the SDG trio have made it to the top of Scala ad Caelum, where Xehanort awaits. We get flash panels of the battle where we see different attacks being used on both sides. Sora matching and dodging Xehanort, Donald firing magic flares, Goofy shielding the trio from a barrage of light rays. Xehanort then raises a platform for the second phase of the fight, then used the X-Blade to take away Sora’s light, blinding and inducing Rage Form on him.
Rather than seeing how Sora fights with it physically, we get a look inside his head. He can barely see anything, Xehanort appears as a shadow, taunting him, and when Sora tries to strike at him, he obliterates a piece of the building they were on. Sora takes notice that he feels an overwhelming sense of power within him, and when he tries to use it, he’s definitely getting some clean hits. Unfortunately those hits are on Donald and Goofy, who manage to snap him out of Rage Form. Sora immediately apologises, not realising what he’d done, though thankfully Donald and Goofy are still kicking.
Then we read this phrase,「そのまま闇に染まればよかったものを」. I’m not sure if it’s Sora or Xehanort who’s speaking here, but Google translates it to “I should have just let myself be stained by the darkness.” Though I imagine if it’s Sora talking, he’s actually saying he shouldn’t have, while if it was Xehanort, the “I” and “myself” would be “you” and “yourself” since he’d be talking to Sora.
Anyway, we get to Xehanort firing his final beam at the trio, Sora blocking it to protect Donald and Goofy. He’s thinking back to everyone trying to keep Kingdom Hearts shut, he’s trying his best to hold out, but he’s fading fast. But before it’s game over, we see Donald and Goofy rise to help Sora finish Xehanort off with a Trinity beam.
The chapter ends with Xehanort claiming that it’s too late, and when Sora asks what will happen, Xehanort says(and I’m doing a rough translation), “Purification.. the world will reset to its original state.”
Next chapter is most likely going to be the aftermath, with Xehanort explaining his motives, everyone else coming in and Eraqus and Xehanort parting to the great beyond(or wherever they go) together, Kingdom Hearts being sealed and Sora going off to find Kairi. Whether or not we get any Re:Mind material adapted will most likely be confirmed then.