Waterfall is a 
Vladof Grenade
Waterfall Causes additional explosions when damaging targets.
Can be found in the Elements: Kinetic , Fire , Shock , Radiation , Cryo , Corrosive
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How to Unlock the Legendary Waterfall Grenade
Legendary Loot
Ordnance
Overview
How to Unlock
Unlock Location:
- Progress through the story until reaching "One Fell Swoop" main quest.
- this quest will take you to the Dissected plateau.
- Complete the Quest at the end you will encounter the Bio-Bulkhead boss.
Farm Method:
- Defeat Bio-Bulkhead.
- After use the Encore Machine nearby to reset the fight.
- Repeatedly defeat Bio-Bulkhead until Waterfall drops.
Vex
Phase Phamiliar
Dead Ringer
Amon
Onslaughter