From Destinypedia, the Destiny wiki
- "A grenade that detonates on impact, releasing multiple drones that seek nearby targets. Each drone slightly scorches affected targets."
- — In-game description
The Swarm Grenade is a Solar Grenade Ability. Upon contact with a surface, the grenade splits into several drones that hover in place. When a foe passes close to a drone, it detaches from the group and starts following them, inflicting low damage and scorch on impact. This grenade is also used by Siviks, Lost to None and Lightbearer Acolytes, the latter of which inflict a regular Solar burn with them.
The drones of a Hive Swarm Grenade.