Sorrel's Chaining Missile (5e Spell)
From D&D Wiki
|Casting time:||1 action|
You fire a glowing dart of magical force toward a target of your choice that you can see in range. The dart deals 2d6 force damage. Three darts then leap from that target to as many as three other targets, each of which must be within 30 feet of the first target. Secondary darts deal 1d6 force damage. A target can only be a creature and can be targeted by any number of darts which strike simultaneously. If a feature would increase the number of darts in this spell the secondary darts are increased not the initial darts.
At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, one additional dart leaps from the first target to another target for each slot above 3rd.