[Briar_Rose]

Minerva enters the library after some personal investigation and searches the shelves for a very specific set of criteria:

• An Artifact, specifically from Selune during her fight with Shar, when a part of her fell to Toril
• It's known locations or possible rumors, written by anyone from experts to amateurs.
• The theorized effects of said artifact
• Theories on acquiring and/or finding said artifacts (if any)

Furthermore, she sets up more research:

• If celestials can be destroyed - knowing most fight end in banishment to the celestial realms
• The methods to permanently destroy a celestial, if possible
• The consequences of destroying a celestial

[Gmork]

Regarding the myth of the godly essence/artifact, no mention of it ever says where it fell or even if it fell to Toril. Some speculate that perhaps the essence is the moon it's self or the tears that follow behind it, others mention the morning star as being the pice; still, others say that it ended up in, or becoming the Positive Plane or being lost somewhere in the astral plane.
Just as you are about to give up on the search you do read one very small snippet that, of all things, Gnomes believe that a shard of some god lies deep in the center of the world and is a gem of the purest and most beautiful makeup to behold.

There is not much written on the death and destruction of celestial beings in this library.