CLUSTER BOMB - Rockets create cluster bombs when they detonate.
Rocket detonation spawns cluster bombs
In Destiny, CLUSTER BOMB is a Weapon Upgrade that can be found on non basic Rocket Launchers in the game. Weapons in Destiny pull each Upgrade at random from specific pools (with a few Weapons that are an exception).
To see more info on exactly which Weapons this Upgrade can be found upon click the link below:
To see more about how this Weapon Upgrade fits into these pools, please click the links below:
ROCKET LAUNCHER WEAPON UPGRADES