The Living Skeleton from the 7th Voyage of Sinbad
The living skeleton is among the most famous stop motion creature created by Ray Harryhausen, featured in both films The Seventh Voyage of Sinbad as well as Jason and the Argonauts. In both films, it proves to be quite powerful in battle.
In the latter film, 7 skeletons are spawned from the teeth of the slain Hydra by King Aeëtes of Colchis, as revenge for Jason and his men stealing the Golden Fleece. After Jason uses the Fleece to heal a wounded Medea on top of a cliff, Argos takes Medea back to the Argo as Jason and two of his toughest men fight all 7 skeletons that arise from the ground; five are immediately spawned with swords and shields and another two are carrying spears. After Castor and Phalerus are slain in battle, Jason realizes that the only way of defeating his undead foes is to jump into the sea, where the skeletons "drown" and Jason and his crew return with Medea to Thessaly.