[SPAAAACE!]

Zee frowns at the dead servitor.

Hemoglobin is all bound up?

Like...

Carbon monoxide poisoning? Because that's what carbon monoxide does. Binds to hemoglobin and prevents it from binding oxygen. Or something more exotic?

"The people back in the hall were killed with some kind of chemical weapon. Binds to your blood and prevents it from taking up oxygen. You suffocate in spite of being able to breath," Zee reports. "I don't think there's any left in the air here, though. And it definitely isn't a tyranid weapon. It isn't organic. Unless they've taken to using simple chemical compounds to mess people up which I wouldn't put past them."

They're jerks like that.

"There isn't anyone else in here. Just a bunch of harmless insects."

Were the silverfish feasting on book glue?

That's something they really like. Basically any source of carbohydrates, really.