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- "An explosive grenade that attaches to targets, damaging and moderately scorching them on detonation."
- — In-game description
The Fusion Grenade is a Solar Grenade Ability. The grenade is thrown at a long range, and sticks to targets and surfaces. It then charges for a second and explodes, inflicting high damage and slight scorch.
- The Touch of Flame Dawnblade Aspect makes the Fusion Grenades explode twice.
- The Ashen Wake Exotic Armor causes Fusion Grenades to explode on impact, refunding energy depending on the amount and rank of enemies slain by the explosion, as well as increasing throw range and speed.
- The Starfire Protocol Exotic Armor gives an additional charge to Fusion Grenades, makes empowered damage and final blows restore Fusion Grenade energy, and causes Fusion Grenade final blows to restore Class Ability energy.