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The Mysterious Man wasn't happy. His book hadn't done much, and Happosai had clung onto the receptionist at the public baths and was currently flying over an Ice-Covered place called Greenland. Those outer-worlders were spoiling too much of his fun for now, and he didn't know what to do about it.
That situation didn't last long.
The Man looked over at the case he was keeping that shard he had found in, and the object sitting on the shelf below the shard. The object alone would be enough to throw the outer-worlders for a spin, but energy from the shard would make things much more interesting. The Man didn't want to miss anything, so he almost literally froze time in his creation while he worked. In reality about a second passed by for every day or so where he was.
Approx 1 month(Man)/30 seconds(Everyone else) later
The Man had been working for a good month, laughing at the havoc he was about to cause with the outer-worlders. He had seen enough of their powers used to know how to absorb them, he had used that knowledge in creating the dimension he would eventually meet with them in, but now he had the same quality in a cursed item. Any attempt by the outer-worlders to take out the curse would cause the curse to become stronger as their powers would be added to the curse instead of taking the curse out. The curse gave off the aura of the shard, and would appear to be too much of a trap, but the outer-worlders wouldn't have a choice but to try and stop this curse. That was, of course, if they could pinpoint the item that was cursed.
Soon the timeframe difference was undone, leaving both worlds running at the same pace. The Man considered where to put the cursed item in the town. After a few minutes of thinking the Man walked into a clock shop and placed his cursed clock on the shelf. At the stroke of 12 noon the next day the curse would trigger. The Man, in his haste to get back before being found, allowed his presence to be detected as he left the world. His cloak wasn't off long enough to pinpoint where he had been, but it was off long enough for the outer-worlders to know he had been there.
The Man prepared a giant bowl of popcorn and sat down in front of his Mirror, for this was going to be a very good show. With a wave of his hand his mirror became a giant TV with many "picture in picture" windows. When time broke loose, literally, and everything started going at different speeds the outer-worlders would have a hell of a time doing much of anything. Throw in the constant, surrounding falsified aura of the shard and the energy-absorbing nature of the curse and there could be issues for days. Which, in some places in town, would be seconds and in others it would be weeks.
The man only regretted that when the curse was finally done and over with the entire town would return to normal time, at the point that the curse had triggered, as if nothing had happened. But the outer-worlders would remember it, that was for sure.
Of course, he would most likely be interrupted before time broke loose by the outer-worlders finding their gifts, but that would be easily taken care of. He was more interested in their reactions after the curse was triggered. It was a good thing that he had arranged for their pendants to not work during the curse.