Eradication is a 
Vladof AR
Its special effect is Extinction - On Kill, fire underbarrel projectile at up to 2 nearby enemies at 150% Damage.
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How to Unlock The Legendary Eradication Assault Rifle
Weapons
Legendary Loot
Overview
How To Unlock
Unlock Location:
- Activate The Desert Dreams, Vault Card.
- Earn Points by completing challenges and leveling up.
- Once you have enough points you will be able to purchase the Eradicaction from the Vault Card.