One of the missing ones you get from a Styx F1 backstage, but I haven't found the fourth yet
That's what I thought was the case. Good[?] to know it's a thing I'll have to do over multiple runs, I guess.
Update: found the third and went back to the crypt thinking I knew where the fourth was going to be, but I guess not. I feel there's another sigil in Styx that I'm missing, but I have no idea where it'd even be.
