And thats why i said Dev team will have to do abit of deciding on how to give it a downside, maybe there is a chance it rerolls for something not as good. So i have 4 m4 asi, and i reroll 3, maybe 1 rolls for a golden ak...worse, 2nd rolls for a Bazooka, not better but its different and does something different so im still happy. Reroll a long claw, and it rolls for a scythe, awesome a completely diff wep that is useful, and 2nd long claw rerolls for infinity guant, not as good as long or EKS, but at least its something u can use. Doesnt have to be exact value, just like a ballpark range to keep it useful.
Like i would happily give up one of my asimovs for a bazooka, 100$ less in value but its just different, and might be useful in a different situation rather then have 3 extra items that can never be used.
And i think obviously u wanna keep it kinda limited, like reroll a wep, can only get a wep, so u dont get people rerolling longclaws and getting a full crystal set just becasue they are same value.
And that instance thing is a good idea, get reroll tickets via doing instance or whatever devs decide for that matter, maybe after 200 raids u get 1 reroll ticket or something. They can figure out what seems fair and go with that.