Fey Crafter

The Fey Crafter (Roots) can be used to craft certain materials such as Rune Stones. To use, the crafter must be placed adjacent to an activated Grove Stone. Right-click to the crafter to open the inventory and place the required materials. For runestones you need 4 stone and one Lapis lazuli (see NEI/JUI or books for recipe).

Then right-click with a Stone Knife (or higher) to collect the materials. Multiple sets of the same material can be obtained (e.g. 16 runestones vs 8) by doubling up materials in the fey crafter.