The Reset Scroll is an in-game consumable used to change Mythic Gear Faction bonus.
Each scroll can be used only once to randomly change the faction bonus on gear.
Reset Scrolls can be obtained every week from Weekly Rewards and from various events.
To use the scroll select a Mythic item with a faction and press Reset button, then press the Reset button again and the game will roll a faction for your item.
The faction is chosen randomly but it cannot be the same faction as the one you started with.