DEADPOOL & WOLVERINE: Halle Berry Talks Not Returning As Storm; Aaron Stanford Reveals Pyro Variant Identity

@LSHF - I was thinking about that, maybe they could’ve played with their not being any ‘weather’ in the void and she’s unable to use her powers?

@gambgel - I kinda liked the idea that was floated around before "Doomsday" was announced that they'd build an "Avengers vs. X-Men" movie out of "Kang Dynasty". Thinking about it D&W made it really easy to write a set-up for it:

After the events of "Deadpool & Wolverine" the TVA created a second, unconsequential timeline in lieu of the Void, known as Timeline-X. Here the TVA sent the survivors of "Deadpool & Wolverine" and created a perfect X-Men universe, one which doesn't end in certain doom for mutants like all the others seemed to end in before. However this unprecedented act of mercy causes ripples within the TVA itself and for the sacred timeline as well. Timeline-X threatens to become a bigger and stronger time-stream, one that threatens to replace the Sacred Timeline. This is where the movie opens: We find B-15 and her side of the TVA at war with a splinter group of the TVA, led by Mobius, who are batteling for supremacy of the headquarters. Their battle leads into the complete destruction of the TVA however, one which only few seem to escape through portals. Among them Mobius, who escapes into the MCU and B-15, who badly wounded, crashes in Timeline-X.
B-15 is found by the "prime" version of the X-Men and brought to Xavier, through his powers he summises that Timeline-X and The Sacred Timeline are converging and causing Apocalyptic effects for both timelines. However, there's a way for one timeline to reign supreme, by getting hold of the God of Stories, Loki. To get to Loki the X-Men must travel to the ruins of the TVA and find a way into his recluse dimension from there.
Mobius has the same conclusion and attempts to assemble the "perfect" team of Avengers to aid him in his mission. We now see Xavier (equipped with a deceased B-15s knowledge and her time travel device) and Mobius assemble their teams, the sequences don't intercut as to not break each universe's flow. The first assembly sequence focuses on the X-Men.

Cont'd

We finally follow the main-team of X-Men to the remnants of the TVA. A purple looking fog lays over the ruins, almost looking like the colors of a Sentinel. This group only has the information that "The God of Stories" can be found through a secret portal within the TVA's HQ. Through their eyes we see this, to us, unknown world (fish out of water style). This leads into the first major fight of the movie, the Mrs. Minutes AI recognises the X-Men as unwanted elements and goes to Kaiju size. A battle ensues that sees Beast badly crippled and almost killed, the fight can only be won after the "Prime Avengers" appear and help them take down the rogue AI. The teams actually work really well together, showcasing that they don't need to be enemies. However the peace is broken once both sides make their intentions clear, the potential fight is stopped by Cyclops skills for diplomacy working well off Captain America. Cyclops notes that it isn't their intention to destroy the Sacred Timeline, as this isn't Xavier's way. This leads to the first friendly interactions as Strange remembers the version of Xavier he met, an uneasy alliance is built and we now have successfully combined the X-Men with the Avengers (for now).
This leads to some fun interactions between Wolverine/Cap, Deadpool/Iron Man, Jean Grey/Vision and Thor/Storm. Mobius takes the team to the portal to Loki's pocket dimension, there the team is confronted with Magneto and his brotherhood. However Magneto's, non unfounded, words manage to split apart parts of the team. In particular Wade joins Magneto's side as he's reminded that Vanessa is part of Timeline-X. Magneto proves to be the MVP in this fight as his power over metal pretty much immediately takes Wolverine, Cap, Iron Man, Colossus and Hawkeye. Meanwhile Juggernaut makes short work of the rest. While the main group is splintered and heavily injured only a fraction remains that makes it through the portal after Magneto. Spider-Man, Captain America (without his shield), Mobius, Black Widow, and Thor make it to the pocket dimension. Meanwhile Vision attempts one final trick against Magneto and accidentally is zapped to Timeline-X, where Professor X was left.
It's with Vision we pick back up, he gets to take out various Brotherhood mutants until he meets Xavier. The two strike up a witty conversation about the importance of always trying to save everyone over just themselves. However Xavier's "warden" is revealed: it's the X-Men universe's version of Wanda. Vision is shocked to his core to see his love-interest revealed as part of both timelines. A relatively short fight erupts and Vision is beaten.

Mobius and Thor meanwhile look for old-man Steve but find him stepping out of the classic chamber, reinvigorated with the Serum. "I can't sit this one out", he says to Mobius and convinces him to have him join the last stand of his universe.
As the rifts open between both universes we get a Portals-esque sequence for both the X-Men and the Avengers on a battlefield that mixes the Avengers Tower with the X Mansion.
The two classic groups stand opposed to each other, most don't want to fight but know they have to, to protect their timeline. Peace was never an option, as it turns out.
The battle begins with Mobius trusting in Steve and zapping him on the battlefield.
We hear their battle crys. "Avengers Assemble" and "Mutants, behind me" their individual leaders decry as the battle erupts.
In this epic battle we get a whole bunch of significant deaths: Storm is electified to death in a battle of storms by Thor, Hawkeye is riddled with cards by Gambit, Ultimate Iron Man and War Machine are crushed in his own suit by Magneto. The battle continues with Magneto focusing on Steve.
Meanwhile Professor X manages to empower a defeated Vision to break him out of his magnetic prison. The two make their way to the battlefield but are chased by Scarlet Witch. Xavier attempts to mentally cry out to his X-Men that murder is not the way, some of the X-Men and Avengers listen to Xavier and attempt to stop the carnage, we have Cyclops and Strange work together to build blockades to stop the teams from killing each other. However not everyone is up for peace, Wolverine and Thor are both in berserker rages as they both just lost loved ones. The two immortal beings battle each other in a violent manner until their rage has turned to grief.
Magneto attempts to fire the hearts of the mutants from his universe but the claming words of Xavier stop him from it. In his best shot Magneto manages to throw a massive spike into Captain America, however Xavier attempts to stop him with all his might. Xavier uses all his power to get through Magneto's helmet but ultimately can't stop Magneto. Magneto, having killed Steve, believes to have won for good. It's only as he turns his head to Xavier that he realises what he has done, Xavier is dead. Having used all his power to stop Magneto from killing a man and an entire universe. Both Anchors are dead.