User blog comment:Plexioth- xD/Monster Hunter 3 Ultimate/@comment-4421067-20120505191829/@comment-4555457-20120505195110

Cannon Mask: launches the other shakala at the monster for heavy damage

Pitfall Mask: Lays a pitfall mask

Rathalos Mask: lets out a roar that acts like a sonic bomb

Melynx Mask: throws bombs that have a felvine affect and sometimes drops items to pick up

Gagua Mask: supposadly boosts item efficancy, not confirmed

Golden Mask: blocks most attacks, after it blocks so many times it will go into a rage mode where it attacks relentlessly but its health bar starts to drain

http://www.youtube.com/watch?v=rJW-OTVqv3A

reference