Tome's Tumultuous Gravity Bubbles

You create 2d4 + 3 tiny gravitational anomalies, or bubbles, in your space. They float in the air and orbit you for the spell’s duration. When you cast the spell — and as a bonus action on each of your turns thereafter — you can expend one or two of the bubbles, sending them streaking toward a point or points you choose within 120 feet of you. Once a bubble reaches its destination or impacts against a solid surface, the bubble collapses, rending spacetime for a moment. Each creature within 10 feet of the point where the bubble collapses must make a Dexterity saving throw. On a failed save, a creature takes 4d8 force damage and is pulled to the centre of the gravitational anomaly. On a successful save, a creature takes half damage and is not pulled to the centre.
These bubbles can affect terrain. Stone, grass, wood or sand will be sucked up in the implosion, whereas metal and other resilient substances will remain, albeit with a permanently altered surface texture and colour.

At Higher Levels. When you cast this spell using a spell slot of 7th level or higher, the number of meteors created increases by 3 for each slot level above 6th.