Destiny 2 — Fishhook Lock Opened / Dark Armory Key Location for your puzzle box exotic pursuit.
To be able to unlock this component of the box, then you need to shoot particular items in the EDZ Forge, Volundr Forge. There are. One outside the arena on the left. Another in the cave contrary to the cliff.
Ruin them both, If they spawn. You need to finish the forge, a loot cache will be found by you .
A synopsis of the Mysterious Box, its place and the Locks are available here.