How to farm it? See the full plan Part of: Fragor
Where it drops
FAQ
Where does Fragor Blueprint drop?
The best source of Fragor Blueprint is Endless: Tier 6 (Duviri), at 1.03% per reward according to Digital Extremes' official drop tables.
Can Fragor Blueprint be traded?
No, Fragor Blueprint cannot be traded: you have to earn it in-game.