Da'leth's Arcane Artillery

An aura of arcane force surrounds you, increasing your AC by 2 and granting you resistance to force damage. You can use a bonus action to convert this aura into an orb of arcane force that you send to a point you can see within 120 ft. The orb explodes in a sphere with a 10 foot radius. Creatures within that aura must make a Dexterity saving throw, taking 2d12 force damage on a failed saving throw, or half as much on a success. If you use the aura in this way, you lose the bonus to AC and the resistance until the start of your next turn.

At Higher Levels. When you cast this spell using a spell slot of 9th level, the bonus to AC is +3, you gain immunity to force damage, and the damage increases by 1d12.