Boomer is a 
Loveless Class Mod
Contaminants now deal Damage based on Loveless equipped Grenade, matching its Elemental type.
Contagion deals Ordnance Damage in addition to its other types.
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How to Unlock The Legendary Boomer Loveless Class Mod
Class Mods
Legendary Loot
Overview
How To Unlock
Unlock Location:
- Progress through the (Raid Boss 1) until reaching the Boss
Bloomreaper The Invincible
Farm Method:
- Defeat Bloomreaper The Invincible to get a chance at the Boomer.
- Repeatedly complete Bloomreaper The Invincible until the Boomer drops.