Honeymooner is a 
Maliwan SMG
Its special effect is Rising Action - On hit, increase Status Effect Damage Taken by the target by +20% for 3 seconds, stacking up to 5 times.
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How to Unlock The Legendary Honeymooner Maliwan SMG
Weapons
Legendary Loot
Overview
How To Unlock
Unlock Location:
- Progress through the (FL4k And The Last Resort) DLC until reaching the Boss
Megan
Farm Method:
- Defeat Megan to get a chance at the Honeymooner.
- After use the Encore Machine nearby to reset the fight.
- Repeatedly defeat Megan until the Honeymooner drops.