Excalibur Mimic

Excalibur Mimic, also known as the Holy Sword of Mimicry, is a Holy Sword and  one of the seven  Excaliburs.

Summary
One of the seven Excaliburs created after the original Excalibur broke. It was then kept by the Church for safekeeping along with another Excalibur. It was wielded by Irina in Volume 3 before being stolen by Freed Sellzen and fused it with Excalibur Rapily, Nightmare and Transparency. The Fused Excalibur was then broken and the fragments were returned  back to the Church to be reforged.

Appearence
Although Excalibur Mimic can take on many forms, it's true form has never been shown.

Abilities
Excalibur Mimic  has the ability to transform itself into any shape, weapon and material it's wielder's desires.