Silverwing

Silverwing is a giant ice bird boss, created as a prank boss by the Administrators, which appeared during the Second Event.

Appearances
It guarded the eggs of Syrup and Oboro at the top of the mountain summit. It first faced Chrome and his group and effortlessly defeated them. However when Sally and Maple arrived to said area they put up quite a fight against it. After that it was then beaten once and for all by Maple as she used Hydra on it and upon defeat the item that it dropped will be one of its feathers (for the anime) and talons (for the light novel/manga).

During the 19th episode there was a red variant of Silverwing as it built its nest within a huge tree, as for this one it was defeated by the combined might of Maple and Syrup as it dropped one of the three keys.