Drifting Magic Mine

You choose a point within the spells range and a translucent mote of magical energy appears there. You can move the mote up to 15 ft  in any direction using a bonus action on your turn. The mote is difficult for creatures to spot and has a passive stealth score equal to your spell save DC. When a creature besides you moves within 5 ft of the mote it explodes with magical energy. Each creature within 10 ft of the mote makes a dexterity save, on a failure they take 4d4 force damage. Taking half damage on a successful save.

At Higher Levels. At 4th level the number of motes you create increases to two, you can only move one mote at a time with your bonus action. At 6th level The number of motes you create increases to four, you can only move two motes at a time with your bonus action. At 8th level The number of motes you create increases to eight, you can only move four motes at a time with your bonus action.