Storm Sphere

Level: 4th
School: Evocation
Casting Time: 1 action
Range: 150 feet
Components: V, S
Duration: Concentration, up to 1 minute

Description:

A 20-foot-radius sphere of whirling air springs into existence, centered on a point you choose within range. The sphere remains for the spell's duration. Each creature within the sphere when it appears or that ends its turn there must succeed on a Strength saving throw or take 2d6 bludgeoning damage. The sphere’s space is difficult terrain.

As a bonus action on your turn, you can cause a bolt of lightning to leap from the center of the sphere toward one creature you choose within 60 feet of the center. Make a ranged spell attack. You have advantage on the attack roll if the target is within the sphere. On a hit, the target takes 4d6 lightning damage.

Notes:

• Bludgeoning Damage: Applied to creatures within the sphere and upon entering it or ending their turn there.
• Lightning Bolt: A bonus action allows additional lightning damage to a single target within 60 feet of the sphere's center.
• Difficult Terrain: The area within the sphere slows movement, potentially trapping or hindering enemies.
• Concentration: Requires focus, so if you take damage or cast another concentration spell, you risk losing the spell.

Source: Xanathar's Guide to Everything