History of Cataclysm

Cataclysm is a Voidwalker Warlock super augmentation (Attunement of Chaos tree) that changes Nova Bomb: "Nova Bomb travels slowly and seeks enemies. Detonations shatter into smaller seeker projectiles. Fire your weapon at the Nova Bomb to detonate it early."

Details

Destiny 2 Wiki says it makes four homing bolts on detonation and allows manual detonation by weapon fire. The sources do not state the expansion that introduced it. The alternative is Vortex. Both work with Devour-style Void builds.