Excalibur

The is a mighty sword wielded by the king of the Kingdom of Camelot, Arthur Pendragon.

Appearance
Excalibur is a broadsword with a very wide blade. The grip has a dark swirly appearance to it, giving the appearance of a cosmic void. The cross guard has a hollow center, and a sharp diamond shape with pointed edges that matches its pommel. The rain guard is adorned with jewels, that emenate with regality.

History
Excalibur suddenly fell from the sky and was stuck in a huge rock in the Kingdom of Camelot, where people believed that it was a holy sword of God. Many Holy Knights tried to get it out, however, they failed until the appearance of Arthur, who successfully pulled out the sword, and became the new king of Camelot.

Current arc
After Camelot was taken by the Demon Clan and placed under the control of Zeldris of the Ten Commandments, the demon tried unsuccessfully to remove the sword from the ground where it was stuck.

Some time later, Arthur decides to infiltrate the castle to retrieve the sword and use it in battle against the demons. After seeing wounded Cath, and a conversation with Meliodas, who betrayed his friends, an angry Arthur pulls out the Excalibur.

Abilities
Although most of his abilities are unknown, Excalibur is a magic sword that won't bestow it's power upon anyone except the one it has chosen. The source of its power is completely opposite to that of the Demon Clan's.