This gives you the Witch Rank in game & the Witch Hat. You can see an image of the Witch Hat by viewing the image below, equip it in game by using /cosmetics and clicking the Witch Hat! The Witch Rank grants a Purple -> Green chat gradient in game when equipped.
You can equip your rank in game by doing /ranks, clicking Cosmetic Ranks and scrolling over to Witch Rank. You CANNOT equip two ranks at once. If there's any issues, feel free to open a Ticket on our Discord describing the issue.