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CRAAASH!
Space itself shattered behind us. A large crack in the middle of thin air emerged, revealing a twisted red and black dimension at the other side. From within, an ominous and demonic presence began to emerge into the dungeon's last floor.
We were all taken aback, although I kept myself calm while looking at the scene, quickly drinking an MP Potion while I was at it. Whatever was coming from within, it was surely demons. I had heard about Demon Gates opening randomly in areas that were very close to Demon Towers.
However… wasn't this a bit too much? I had not detected any sort of demonic artifact or demonic circle which invoked this, so this could only be explained as a "naturally occurring" Demon Gate, which spawned randomly anywhere, and flooded an area with Demons until the Boss of the Gate was defeated.
FLUOOOOSH!