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Two Matthias posts in one day? More likely than you'd think.
This is an absolute crack theory but HEAR ME OUT.
What's a speculated ability Matthias may have? Being able to turn into his puppet.
What would he have to do to turn into his puppet? Put his consciousness into it.
What happens to most survivors during the manor games? They die/get murdered.
My theory is that Matthias' ability comes from him dying during the manor game and possessing his puppet to take revenge or smth idk. We know that ghosts possessing special objects to them is possible in the IDV universe from Wu Chang's umbrella and all the drama in game 5 so I'm just saying it's possible and we won't know until like a year or two in the future when he finally gets a damn letter because netease doesn't like to update their lore regularly because WHY WOULD THEY-
Tl,Dr Matthias' ghost possessed Minitthias to take revenge on whoever killed him in the manor game