The Lighter side
Looks just like a regular Soul Fragment, but damn!!! on use....
They can be found to drop at the NE Un-Redeemed Temple in Penumbra. At this temple location there are 2 static missions as you approach from the south 'road' entrance. A 'bird' mission to your right, and a lvl 205 mission to your left. Take the left mission. Also a good place for farming high level weapons and spec. 3 and 4 books.

This thing sets your shadowbreed
Its Breed specifice.g. for Atrox, if I have this item and right click on it at the required level I get these additional "perks"
lvl 205 I become
Luminous Effect :
Screen of Lightlvl 210
Splendent Effect :
Shield of Lightlvl 215
Metoric Effect :
Fortress of Light"Walking down a path, choosing what sides. You have found the holy grail! To obtain Shadowbreed phase 1, you need to be atleast Shadowlevel 5. To obtain the second phase you need to be atleast Shadowlevel 10 and to obtain the last one, you need to be atleast Shadowlevel 15. If you try to use this item, and you dont have the needed Shadowlevels you will loose the item forever. So thread carefully friend. Good luck!"