Onsilur's gem prison

Onsilur's Gem Prison was a kiira of a forgotten elven house that was used to imprison Onsilur Maerdrathom at some point between and.

History
The kiira belonged to a house unknown as of the late 14 century DR. Ansel Burwyth employed it to trap Onsilur Maerdrathom inside at some point before, and hid the gem. It was still unfound by the late 14 century DR, by which point Onsilur went insane after being trapped inside for so long.

Powers
Onsilur's sentience faintly babbled out from inside the gem in the form of speech or descriptions of memories stored inside the kiira.