Shardenfreude is a 
Daedalus AR
Its special effect is Shards - Bullets stick. On Mode Switch, throws attached projectiles, which explode on impact.
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How to Unlock The Legendary Shardenfreude Daedalus Assault Rifle
Weapons
Legendary Loot
Overview
How To Unlock
Unlock Location:
- Progress through the (FL4k And The Last Resort) DLC until reaching the Boss
Jr. Manager Warrant Baggett
Farm Method:
- Defeat Jr. Manager Warrant Baggett to get a chance at the Shardenfreude.
- After use the Encore Machine nearby to reset the fight.
- Repeatedly defeat Jr. Manager Warrant Baggett until the Shardenfreude drops.