Stormcaster

Prerequisite: The ability to cast at least one spell

When you cast a spell that deals damage, you may choose to have it deal thunder or lightning damage in place of its usual damage type. Once per turn, when an enemy is affected by one of your spells of first level or higher that deals lightning damage, they cannot take reactions until the start of their next turn. If the spell deals thunder damage, they are pushed five feet in a direction of your choice