The Colossal Chocco Chicken is a boss fought during the 2018 Easter event. The first time it is fought, it takes the colour of the idol that the player picked during the event, and can only be fought solo. After the event, the chicken takes on a rainbow-coloured appearance and can be fought by groups of players simultaneously. Unlike most monsters, the Colossal Chocco Chicken does not have a combat level.
In addition to being able to be attacked with normal weaponry, the chicken can also be damaged by chopping the support beams, mining the support columns, or burning kindling underneath him. These 'attacks' deal far more damage than normal attacks.
Every few seconds, the Colossal Chicken will summon several smaller Chocolate Chickens.
Unlike most monsters, the Colossal Chocco Chicken drops a very large amount of items in a large area.