The last 50% of the books pages are incomplete, and it appears to be mostly full of handwriting and sketches, though fairly good sketches. It's written in common.
The 18th to last entry is the bow.
[sblock=Compendium]Origin: The Unseelie Court, the Lord Kalaynr
Kalanyr had been serving some sort of fey queen that wished to reinstate her power on the mortal worlds in a place they referred to as the stolen lands. There were also forces from the plane of shadow working against both the mortals and the fey. Killing Kalanyr seems to have destabilized his particular planar domain, crashing the warren completely. This was recovered by one of my expeditionary forces, a decent memento still instilled with much of the original owners personality. I suspect his death drew a great deal of immediate attention from the unmaker. Power draws power.
Perhaps it can be used with one of the guardians, but I know none that would be able to completely resist the pride of the soul trapped within.[/sblock]