Ouroboros

The is a magic sword capable of changing its size.

Appearance
Ouroboros appears to resemble a normal-looking cleave, something which has a total of five half-moon holes alongside the tip leading towards the edge, having white bandages wrapped around the hilt, having what appears to be an ouroboros symbol on the pommel.

History
In the past, Ouroboros was a magic sword that Varghese received from Arthur Pendragon, during his time as a Holy Knight of the Kingdom of Camelot. Despite his departure, he kept the magic sword, him and his grandson Percival, often uses Ouroboros as a cooking knife.

Abilities
Ouroboros is a magic sword, capable of altering its overall size based off the wielder's will, most often activated through the act of calling out the name of the sword, appearing to be the size of a normal knife. Lancelot referred to as a first-rate sword, him and Ironside were surprised that such a sword was being used as a cooking knife, it withstood a pointblank attack from the Holy Knight's star-shaped slashing attacks, which inflicts fatal attacks on an unguarded person. As a cooking knife, Ouroboros has shown to be capable of cleanly cutting through fish and animals, in addition to horns without difficulties.

Trivia

 * Its name and the marking on the blade, same as Meliodas' tattoo is a reference to the Ouroboros, a snake or dragon eating its tail, which in some beliefs represent infinity.