Elemental Nullification

For the duration you can reduce the damage dealt by one damage type of your choice: acid, cold, fire, lightning, or thunder.

At the start of each of your turns you regain a pool of 10d8. When a creature or object within 30 feet would take damage of the type you chose, you can roll a number of dice from your pool, reducing the damage taken by the number rolled on those dice.

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the pool of dice increases by 2d8 for each slot level above 4th.