Excalibur Transparency, also known as the Holy Sword of Transparency, is a Holy Sword and one of the seven Excaliburs.
One of the seven Excaliburs created after the original Excalibur broke. It was then kept by the Church for safekeeping along with another Excalibur. During the events of Volume 3, it was stolen from the Church and was wielded by Freed Sellzen before fusing it along with the Excaliburs Rapidly, Mimic, and Nightmare becoming the Fused Excalibur. The Fused Excalibur was then broken in battle by Yuuto Kiba and Xenovia Quarta. The remaining fragments and the Excalibur Destruction was then taken back to the Church by Irina to be reforged. It was later fused into the Durandal along with the other Excalibur fragments.
Excalibur Transparency has the ability to turn the wielder and/or the sword invisible.