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.