Mariah Carey

After you find all 4 of the hidden items in the game game Mariah will spawn on the boss stage replacing X-Nas. She has 2,500,000 HP. Survive her for the full duration of 4 minutes and 12 seconds to defeat her and win The True Wrath of Christmas as well as the Christmas Plushie.
Her four attacks include:
#Partridge Calling - Sends birds at all players dealing lots of damage
#Bird Lockdown - Targets birds at the king dealing an average of 20-25% damage
#Presents - Throws presents from 8 directions dealing lots of damage to whoever touches them.
#French Hen Calling - Mariah calls in 10 French Hens. Mariah cannot spawn more than 30 French Hens.