It's an egg where cute pet Christmas Snow Rabbit has fallen asleep in. With a portable incubator, you can wake up a sleeping monster. Increases EXP by 5% (only during events in official servers).
[iRO Description] An egg that has a Christmas Snow Rabbit inside. These rabbits love to eat Candy. Can be hatched by using a Pet Incubator. Cordial/Loyal Bonus During Christmas, increases EXP by 2%. Matk +2% Type: Pet Egg