Crystal Fang

The Crystal Fang is a one-time use item available at the very beginning of the game, found in the mouth of Spiritkeeper's Birther-creator, Emerald Flame. Depending on when it is used, it will grant Spiritkeeper access to the memories belonging to its Birther-creator, as well as a variable boost to its elemental masteries.

Description
"One of your Creator's teeth was replaced with this mysterious stone. It does not seem to be natural, and you can almost taste an ozone-flavored energy sleeping fitfully within. Perhaps another Kin can tell you more about this rare object."

Research Description
"This is a Memory Crystal which your Creator had within its maw, presumably for safekeeping. It is quite valuable, but only to those who can attune themselves to its harmonies; you could trade it undepleted for 200 small treasures. If you choose, you can put this in your mouth and enter into the Dreaming to access its contents. This would take most of the day."

Usage
To use the Crystal Fang, select your sleeping space, then put the Crystal Fang in your mouth and rest. What you learn from the Crystal Fang varies depending on which Part in which you use it, with its maximum output only being accessible in Part Three.

Upon using the Crystal Fang during Part Three, it offers an array of Emerald Flame's most precious memories. First is one of Vantage, whose connection to Emerald Flame is uncertain. Second is one of Darktooth, who is Spiritkeeper's Giver-creator. Third is a strange structure in a hill that you only gain access to following the use of the Crystal Fang, which Spiritkeeper notes must be connected in some way to Vantage and Darktooth.

Notably, the strange structure in the hill will be accessible during Part Three regardless of when you use the Crystal Fang.