He could keep his Duel Disk, but it would have to be capped so that he can only create smaller illusions (maybe nothing bigger than a small room, for example) and the illusions should be non-harmful. You can decide whether you'd rather nerf his Duel Disk or just get rid of it altogether.
The magic pendant sounds like it wouldn't affect the game much, so... Since it's effectively being turned into a fancy piece of jewelry, he can keep it.
He can totally keep the extra soul and darkness if you want! If someone else apps said other character, they'll just have to be confused about it when it happens. Maybe there were alternate dimension shenanigans involved. You never know.
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He could keep his Duel Disk, but it would have to be capped so that he can only create smaller illusions (maybe nothing bigger than a small room, for example) and the illusions should be non-harmful. You can decide whether you'd rather nerf his Duel Disk or just get rid of it altogether.
The magic pendant sounds like it wouldn't affect the game much, so... Since it's effectively being turned into a fancy piece of jewelry, he can keep it.
He can totally keep the extra soul and darkness if you want! If someone else apps said other character, they'll just have to be confused about it when it happens. Maybe there were alternate dimension shenanigans involved. You never know.
Let me know if this answers your questions!