A fleshed out backstory to the weapons origins. The ARR relic had this, at least somewhat.
Something challenging to prove your merit. A series of solo instance dungeons or something to help drive the story and immerse yourself into why this weapon exists, why you're recreating it now, who used it in the past. (Am I the only one who thought the Zodiak Braves or the Darklight Raiders, etc. were the coolest thing?)

I'm tired of paying of Gerolts bar tab. Let's get some real lore in here.