Stone Knife

The Stone Knife is a later-game tool that is unnecessary unless the player has access to both a Loom and a large quantity of Flax. Crafted with two stones, the Stone Knife is used to cut the Flax plant into Plant Fibers for processing on a Loom. A required tool to create Fabric, the stone knife has no other confirmed uses, but is rumored to be a good weapon (need confirmation).

To create Plant Fibers with this tool, the player needs to hold the knife in their right hand and the Flax in their left. After crafting, the fibers will show up in the left hand where the Flax used to be, and the knife will remain in the right.

Crafting Recipe
Stone in the left hand---Press the q key while the mouse is hovering over a stone.

Stone in the right hand---Press the e key while the mouse is hovering over a stone.

Craft with the r key and choose the option on the list entitled "Stone Knife".

The player will have the tool and a small stone left over, presumably due to the knapping process of sharpening the stone.