Dexihand
Dexihands are turquoise arms with yellow finger tips from Majora's Mask. They often guard treasure or something needed to progress in the game. If you go too close, these things will grab you, swing you for awhile, throw you and deplete your health. Kill it by locking on and launching the Zora Fins at it or use the Zora Electrical attack to kill it.
A Dexihand will always throw you in the same direction you approached it from. But specific ones will throw you away from what they're guarding.