Grindstone

Grindstone is a battle item.

Source
Grindstone can be crafted in the level 5 Workshop.

Research
Grindstone takes July 27, 2024 to research and cost the following materials:
 * x
 * x
 * x
 * x

Crafting
Grindstone takes July 27, 2024 to craft and cost the following materials per item:
 * Material x 3,670
 * Purified Water x 1
 * Crude Bronze x 1
 * Metal Cutter x 1