Hard Dark is a 
Daedalus AR
Hard Dark has a legendary effect "Solidified"
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How to Unlock The Legendary Hard Dark Assault Rifle
Legendary Loot
Weapons
Overview
How to Unlock
Unlock Location:
- Progress through the (A Zane to Kill For) DLC until reaching the Boss CL34n.R
- You will find CL34n.R in far Bottom Left of the map.
Farm Method:
- Defeat CL34n.R to get a chance at the Hard Dark
- After use the Encore Machine nearby to reset the fight.
- Repeatedly defeat CL34n.R until the Hard Dark drops.