Instructions
Load "Disciples 3" and travel to the capital with at least one leader present in the city.
Open your spell book and select the spell you want inscribed onto a rune.
Click the "Create Rune" button in the bottom right of the spell book, and the created rune will go into your leader's inventory.
Make as many runes as you want as long as you have the mana to do so.
Enter into combat and open your group's inventory, select the rune you wish to use and then select the target to use it on.