Skull Anchor

Skull Anchor is an enemy from Mega Man ZX Advent that appears in the Arctic Ice Floe. They are skull-shaped Mechaniloids that can expand and contract at will. They borrow their DNA from a Pseudoroid (possibly Leganchor) and can freeze enemies. Its intelligence rivals that of people. Once it is destroyed by a buster-like weapon, it will then reveal it's inner part. They will be automatically destroyed if attacked by a saber weapon.