The Weapons of Hecatoncheir 30G
Collect all Sub Weapons.

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Every weapon bar 2 can be obtained by defeating the armed enemies and bosses using Sub Weapon Seize. As you work through the Challenges the rarer enemies unlock. You can track your progress via the Enemy Reports in your inventory. The downside is it doesn't tell you which enemies are missing - simply listing ???? until they unlocked. This can make finding them a bit tricky. Check other posts for help their locations. Dark versions are random spawn but can be triggered by leaving locations and returning until they pop up. Once you've unlocked all but 2 of the weapons (you'll be missing an Axe and a Healing Core) return to the Realm Of The Gods to be told you have completed the weapons collection and be awarded the final 2 missing weapons as a reward.