Functional Human is a 
Loveless Class Mod
When Loveless uses a Function, she gains a Stack of Functional, gaining 10% Damage Dealt for each Stack.
This effect stacks up to 10 times and all Stacks are lost when Loveless' Action Skill ends.
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How to Unlock The Legendary Functional Human Loveless Class Mod
Class Mods
Legendary Loot
Overview
How To Unlock
Unlock Location:
- Progress through the (Umbral Foundry) Fortress until reaching the Boss
Vile Lictor
Farm Method:
- Defeat Vile Lictor to get a chance at the Functional Human.
- After use the Encore Machine nearby to reset the fight.
- Repeatedly defeat Vile Lictor until the Functional Human drops.