The small twisted root is a key. It loads on Bill Ferny and can be used to unlock the hidden wall to the east of the room where he spawns.

A small twisted root is sticking out of the ground here.
>examine root
The small root is extremely twisted; its arms are closely knit into themselves
creating a strange, fascinating pattern. It has been cleaned for loose dirt, so
you can really admire the artwork of nature. The short, thin piece of trunk on
it has been shaped into a strange, rectangular pattern. It looks like someone
has put some work into this root to keep it as a work of art or something.

>consider root

It is a small twisted root.
It weighs about one pound.

Items
Armour	Head · Neck · Body · Arms · Hands · Legs · Feet · Shields · Cloaks · Belts
Weapons	Charging · Cleaving · Concussion · Piercing · Slashing · Smiting · Stabbing · Ranged · Ammunition · Embed
Other	Containers · Rings · Wrist · Food & Drink · Scrolls · Boats · Miscellaneous