Excalibur also known as Cal, is the former sword of King Arthur, and one of Flynn Carsen's dearest friends.
Excalibur is a magical sword that any wound it inflicts can not be healed by most means. Excalibur can be used to release magic into the world when inserted into the Stone of King Arthur, which will charge the Ley lines with magical energy, draining and destroying Excalibur in the process.
Powers and Stats
Tier: At least High 6-B, Likely Higher
Name: Excalibur, Cal
Origin: The Librarian
Age: Hundreds of year (Was the sword of King Arthur)
Classification: Sentient magic sword
Wielders: King Arthur, Flynn Carsen
Powers and Abilities: Sentience (Can fight on its own, as well as choose who to obey), Flight, Magic, Power Nullification (Nullifies Healing, wounds made by Excalibur cannot be healed as easily as regular wounds), Healing (Can heal both regular and magic wounds)
Durability: At least Large Country Level, Likely Higher
Weaknesses: Can be controlled by the Crown of King Arthur, Will die if all of its magic is drained
Prerequisites: The sword is sentient, and chooses who to obey, unless the user wears the Crown of King Arthur, if that's the case, Excalibur needs to obey, even if it is against its will