".. Partially, but not really. It doesn't really answer if intense emotion can have power here. . But, I can lay out my thoughts anyway."
The old wizard would take a few moments to cast a handful of Minor Images, except these were a higher tier variant he made that he could move around and actively change.
"You mentioned a Keyblade War. You have also spoken of how a Keyblade is manifested. Such a war, I would surmise, would likely be an Incredibly emotion filled event, with all sides brandishing what amounts to their souls."
The images would show silhouettes of people clashing in a melee, a light at their cores shining through their weapons. He would have their clashes release a display that represented energy and make it all start to hover above the battle.
"If emotion can sway the magics of this world, then my theory is that your war created so much emotion and chaos that it all flowed together into messing with reality. The sheer amount of sorrow that would be created would likely come from people wanting to forget that it ever happened in the first place.. So, it did just that."
He would have the energy form together into a volatile sphere before bursting, making the battle disappear along with the rest of the images. He would look back up to Gula and continue.
"A tale of Lose and Fire and Faith. Made forgotten by the collective suffering of those who were victim to it.. The lingering effects could very well have clung to you and the other survivors, causing the lapse in memory of those you have met, but not completely removing memory of you."
Gula falls quiet and folds his arms, his weight shifting as he locks his attention onto Kabartmak, listening. He has a point about it being a highly-charged emotional event. The lives lost there... mm... not lost, but thst disappeared... he remembers hearts moving into the sky like a backwards snowfall.
He reaches out a hand towards the projection and with a slight touch, the memories fall onto the screen. Children fighting, keyblades clashing. Ira, Aced, Invi, and Ava on the battlefield. A bright moon in the shape of a heart. The hearts indeed, do act like a backwards snowfall as hearts begin to ascend skyward.
He pulls his hand back, his hand moving in a way that it closes into a half-fist. "What you're saying is possible... but if I'm honest?... I never gave it much thought." He's... too jaded and tired to deal with the fact he's looking his trauma in the face on the screen.
He's had time to process it and just... honestly? There's no emotions. Any tears he shed long ago are lost to him now. He simply views it as a war veteran would; a fact of life.
"If it did cling to me... I mean, it's a possibility. Magic systems from different universes clashing can cause... interesting outcomes, so to speak." He turns his head slightly to look at Kabartmak through his mask. "... So my question is; what is it you're looking to test? You say you want to know if emotions can cause those mm, not problems but... what's the word I'm looking for?" He muses to himself. "Ah, nevermind. My point is... I'm all ears if you want to test things a specific way."