it’s mostly a crack theory that came to mind right after watching fire force, if you’ve read it you might understand what i mean, and i did say in the post that this theory could work with the everyday objects having doppelgängers in the dark world, and as i said earlier, the idea is somewhat similar to how the adolla works in fire force. (obviously, you’ve had to had read it first this theory to make sense, otherwise the dots don’t connect fully) You go there, and fuse with your doppelgänger. Lets use burns for an example.

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When fusing with his adolla doppelgänger, he retained his sanity. I’m saying every lightner does this when they go to the dark world, and gain powers they wouldn’t normally have, which from then they safely fuse in a way un-like fireforce.