Each Rune has a symbol of a Skill it gives. If you have the Rune, visit the Tavern and select one of your generals (he must not be on a mission or healing).
Click the “Skill” button. Next, you need to:
- Choose a skill which you want to replace and click on its icon (remember, unique skills can not be changed)
- Choose a Rune and click “Use”
The old skill will be changed with the selected new one. The Rune is consumed.