Sorry... [she pauses to slow herself down, try to reorganize her scrambled thoughts.] I don't even remember what was and wasn't in the black binder.

I don't know much about sigils either, other than they're... some sort of magical spell that's drawn out. A specific intricate shape that somehow holds power. I've only seen Jenny use them, but the Captain does too. He's said before if he's killed, his sigils would fail and the magic holding this place together would collapse. Crabb went investigating... and came across some drawn on a wall, but she didn't know what sigils are either. She touched them, which caused the shape to smear. I can only guess that weakens the magic, if it's contained within that design.

Crabb tried to take pictures but it broke her phone. She tried to draw what she saw, but when I looked... we could only see strange spirals instead. When Crabb tried to get her phone fixed by Friday, Friday realized what had been done and she tossed herself overboard and has not returned.

I'm not entirely sure if it's his soul that Friday is holding, but she is holding a part of him by her own words. Valdis mentioned he believes he does not have a soul. Which is why I think... that might be what Friday is keeping. Sealed away somewhere on the ship, maybe as a power source... or maybe just to keep him safe from being discovered by anyone that wants to enslave him again. Keeping it secret from even himself.