True Reflection

When you or a companion is targeted by a spell you can reflect the spell(level 6 or lower) back to the caster X1d4

The target must make a dexterity saving throw, on a successful save the target takes half the new damage, on a failed save the target takes the full newly calculated damage

As a result you must make a charisma saving roll equal you your spell save, on a failed save you take half the damage of the cast spell,and can only cast cantrips for the next 3 turns. On a successful save you take no damage and can only cast cantrips on you next turn

At higher levels you can reflect spells that are one or more levels lower than the spell slot used (a level 9 spell slot can only reflect a spell level 8 or lower)