So, what do I do with the thing from the Mountains of Madness?

[slo]

I'm back at the library and there's a key icon in my inventory now.
Does it have any meaning or significance? Do I get another ending if I perform the Ritual with the key in my bag?

[🦊Λℚ𝓤ΛƑΛᗯҜᔕ🦊]

Stick it in your mouth and suck on it.