Astral Surge

You can push yourself beyond your normal limits for a moment. On your turn, you can cast one additional spell as an action on top of your regular action and a possible bonus action. 

This spell properties are changed to be of astral nature rather than the spells indicated nature i.e a fire damage spell will now do force damage. 

Once you use this feature, you must finish a short or long rest before you can use it again.