Sho Kunai is a 
Jakobs Grenade
Sho Kunai +10% movement speed with each hit, max 7 stacks. for a total +70% movement speed
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How to Unlock the Legendary Sho Kunai 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
Sho Kunai drops.
Amon
Onslaughter
Vex
Incarnate
Phase Phamiliar