Sinew cord
Knotted many times over for the troll's own reasons, and frayed past holding any of them.
Vendor trash. Nothing in the game wants it: no recipe, no enchant, nothing to wear. Stacks in one inventory slot. Vendors pay 22 coins for it.
What drops it
Mire troll stalker
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.