Contained within that frozen fun bag? Various rewards, including Ice Pellets which you may use as currency. You can unlock swimsuit outfits, special Iciles to absorb all of an attack’s damage, and other goodies. So check out the event starting in the near future, and get ready to stay extremely cool based on the frozen nature of the dungeon. Of course, you may not want to go into the frozen dungeon in a swimsuit, but that’s a different problem.
Blade and Soul for the summer, you’re going to have to get cool. The summer event that’s kicking off on August 15th is going to definitely keep you nice and cool, you see, but that’s because you’re going to be venturing into the Frozen Firing Range. Yes, that should definitely keep you cool, and it’ll also net you a Frozen Fun Bag each time you complete the event’s daily quest.
Source: Official Site