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The Demonic Door wasn't a true Demon, it was a designated Demonic Artifact where a Demon Soul had been infused into it. Its functions were simple, protect, guard, and defend a very important area of the tower, not letting anybody inside except Merlinus and his most trusted allies. Its form wasn't defined by the door, however, as it expanded through the walls and ceiling, capable of slowly "devouring" his surroundings and replacing them with his true body.
His power lies within his eyes, however, as he can create many, firing rapid lasers from every direction, a lethal weapon to most foes, giving the door the power to pulverize them and cover with holes most enemies easily, making it the ideal, loyal guardian that Merlinus could have ever asked for.
