You recognise the text on the artefact as Enochian. There is one person you can think of who might know a little more about this. 

Back in the day you learned a few things from her gnostic workshops, but these days Madame Belladonna makes a living as a tarot reader. You’ve been meaning to check out her regular Thursday night livestream. Come to think of it, she’d be live right now…

As you wander back to the Library, Kat’s phone shatters the silence as it vibrates in her bag. By the time your fumbling fingers reach it, the ringing has stopped. Maybe they’ll call back later?

You placate your worry about Kat by telling yourself that she’ll be back for her stuff any moment now, trying to silence the parts of your mind that scream something is wrong. However, there seems to be little else to do but wait.
To keep your mind off things in the meantime, maybe you should drop in to Belladonna’s livestream on one of the library computers? Maybe she could tell you something about the Artefact…