"But as far as I can tell, he used to be a crew member of this ship. One of the original crew members, not someone like us who showed up by accident. He's wearing a Moira uniform, so that seems to make sense.

Nobody says they know what caused it, but one day he changed. I don't know if he had powers before then, but he started using them all of a sudden to kill his fellow crew members. The Captain and the First Mate escaped through the Ingress to keep from getting killed themselves.

I don't know what happened to the rest of the crew, but Ploiatos got locked away in one of the rooms of the ship eventually. The old captains said that they didn't know he was there when they found the Moira - which I guess makes sense, because they didn't seem to know what to do when he got out.

Then he went around and killed some of our current crew, including one of the captains. She didn't come back, but from what I could tell she was the Captain in charge of the Ingress - probably the one who knew the most about it.

Eventually they locked him back up in another room, and it's been mostly safe in there ever since. I think Sans and Papyrus tried to get inside once (I guess they heard that Ploiatos was a skeleton monster and thought he'd be more like them) and he hurt them both really bad.

That's all I know about him. I wasn't there for the actual attacks, so I can't tell you much about his powers, but I can show you some video of it if you wanna see? It's pretty ugly, though."