Broken oath-token
Snapped across the words of the oath. The knight has kept to them regardless.
Vendor trash. Nothing in the game wants it: no recipe, no enchant, nothing to wear. Stacks in one inventory slot. Vendors pay 453 coins for it.
What drops it
Oathbound knight
1 in 5
Rolled on its own rather than from the loot table, so it takes nothing away from anything else that falls off it.
What it trades for
No trades in the last 30 days.