Find the Gremlin's Checkered Flag Check-In under the Event menu at the bottom-right of the game screen during the event period.
Reach the daily cumulative login time of 1 hour with character(s) at Lv. 50+ during the event, get the check-in stamp on the event UI, and press Receive Reward to get the reward for the relative cumulative check-in count.
If you miss a login day, you can make up for the missed check-in by using an item called "Gremlin's Last-Minute Chance."
*Claim one of the six available Devil Tails.
Any tail claimed from this box is legendary rank and will earn you 36 Wardrobe Points.
*Claim one of six available Fallen Angel Wings.
Claim the Wings part item to earn 3 Wardrobe Points.
*Claim either a Primal Flame or a Primal Red Flame weapon.
*This item can only be used in town.
Grants 27 Wardrobe Points when obtained.
*Claim one of seven available Special Outfits and exclusive Equipment Outfit Sets.