Intense Battle!
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The Demonic Door opened its massive jaws, inviting the party to gamble it against him once more. Despite growing weaker after most of his eyes were destroyed, it would eventually recover, everyone noticed the wall they pushed through had fully regenerated now, and it moved like a giant limb, shapeshifting into some kind of tentacle.
"Just what the hell is this guy?!" Asked Anna. "He ain't no possessed door! He's more like… Like some kind of Mimic Monster, no?"
"Exactly my thoughts, girl," Gandalf nodded. "I believe this is not quite a simple door possessed by a Demon Soul, but a Mimic-like monster that expands inside a certain building, slowly eating and replacing its walls, ceiling, floor, and so on."
"If that's true, then how can we defeat such a huge thing that's everywhere?" Monica asked. "C-Can we even do it to begin with?"
"We must," said Angelina. "We'll kill and destroy everything… We'll have to do that and see if it works."