The blank mind rune is a quest item used in The Slug Menace. It is made by right-clicking on Page 3 of Maledict's holy book and choosing the "shape mind" option with a rune essence or pure essence in the inventory. During this process the player must also make a blank air rune, a blank earth rune, a blank fire rune, and a blank water rune using page 1 and page 2. The player will need a chisel in their inventory to make these runes.
It is recommended that players make more than one blank because players can fail while chiseling the shape of the rune, as well as when binding it with the element of the rune.