VELCOFFER
im not well diverse in the Legendary department. But you can get Legendary Grade items thru Velcoffer Dungeon Raid. and even if you get a Velcoffer weapon/armor, it is a blank slate, it may have DMG or DEF, but it won’t have any stats. But thats when “Ichors” come in. basically you take the weapon/armor stats of another item and put it in your Velcoffer gear.
But i don’t know how the Ichor system works, or the success rate.
RAIDS
Ignas, Asio and Wastrel Raids is where you can get Unique grade weapons and armor.
some raids require you to finish prerequisite quests in order to access some raid instance like Wastrel Raid. Asio requires no prerequisites, but i don’t know about ignas. also each raid requires i think 5-7 “Raid Portal Stones” to enter and each raid has it’s own gimmick to finish…