Skullion

Skullion are the mature forms of the Skullies that appear in Kirby Mass Attack. They have the same appearance, but Skullions have tiny horns on their heads. It takes 100 years for the Skullies to reach this stage, according to Daroach.

In Kirby Mass Attack
Skullions can only be found in the fight against Necrodeus, where they try to repair his broken wrists. Necrodeus will also send some Skullions to attack during the last few phases of the battle. Skullions will still try to snatch up the Kirbys like their younger forms. They faster and stronger than their young forms, but they're still low on health so they are easy to defeat.