Chaumurky is a 
Order Grenade
Chaumurky Incessant Continuously homes in on all target around the Vault hunter
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How to Unlock the Legendary Chaumurky Grenade
Legendary Loot
Ordnance
Overview
How to Unlock
Unlock Location:
- Progress through the story until reaching southwest of The Fadefields.
- You will find a Drill sight icon to the bottom left outside of Fortress Indomita.
- Complete the Drill Sight called "The Pitted Stain" and at the end you will face 3 Foundry Freaks.
Farm Method:
- Defeat the 3 mini bosses in The Pitted Stain Drill sight.
- After use the Encore Machine nearby to reset the fight.
- Repeatedly defeat 3 Foundry Freaks until Chaumurky drops.
C4SH
Sleight of Hand
Rafa
Amon
Crucible