Sock tree

It's a tree. With a sock nailed to it. There's no one else around, it looks just like a normal tree, it doesn't behave differently based on what you do, it's just a regular Sejan tree. That has a white sock attached to it with a nail. So much so that it's stained with the tree sap.

You can take the sock down and carry it in your inventory, somehow valuing it at 99 Adats. You can't sell it to the only vendor in Sejan, Tornoth, though; because who the hell would even buy a sock with a nail in it, let alone for that much money?

Trivia

 * The memoirs of the sock tree date back to 2013. How the author thought of it is unknown, but he was probably excited about it.