@Bismuth-Tipped Dagger is a 
Jakobs Grenade
Elemental Type Toxic
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How to Unlock The Legendary Bismuth-Tipped Dagger Grenade
Weapons
Legendary Loot
Overview
How to Unlock
Unlock Location:
- Progress through the "Mad Ellie Vault of the Damned" DLC until reaching the Whispering Glacier
- Open the Blood clot with the pearl and fight the boss "Corporal Brennan"
Farm Method:
- Defeat the Corporal Brennan.
- After use the Encore Machine nearby to reset the fight.
- Repeatedly defeat "Corporal Brennan" until @Bismuth-Tipped Dagger drops.