Necro-calibur

The is the Servant Universe's Ultimate Anti-Anti-Saber Weapon. Although it is a blade that would evetually be capable of even cutting through a planet, it hadn't fully matured when it first appeared in Fate/Grand Order. Bought through suspicious mail order, Master Agravain states they were foolish to believe in the specs written in the catalog.Fate/Grand Order - Mysterious Heroine X Alter's Trial Quest However, by the time Mysterious Heroine X Alter's first interlude takes place, Ex states that just like Mysterious Heroine X, she is known as an agent capable of single-handedly destroying entire planets in the course of their missions. When the two of them worked together, they could limit the collateral damage to a single planet.Fate/Grand Order - Mysterious Heroine X Alter's 1st Interlude: XXXX. Mysterious Heroines 
The sword can also be freely changed into a twin-blade or a chainsaw, but it often breaks and explodes.
==Variants==
===Cross Calibur===
 is the Noble Phantasm of Mysterious Heroine X Alter. 
Through a spontaneous explosion of the Mana converter Altereactor, a torrent of mana overflowing and breaking through the critical point annihilates the enemy Saber. Although it’s an internalization of Mysterious Heroine X’s Sword of Nameless Victory, there doesn’t exist a sword it belongs to. In that case, a guu-pan (this) would do as a Noble Phantasm as well. However, as her nemesis Heroine X isn’t covered by the special feature of Sabers, it’s a sadly different Noble Phantasm.
==References==
Category:Noble Phantasms
Category:Anti-Unit Noble Phantasms
Category:A+ rank Noble Phantasms
Category:A++ rank Noble Phantasms
Category:EX rank Noble Phantasms
Category:Noble Phantasms of Artoria Pendragon
Category:Swords
Category:Noble Phantasms introduced in Fate/Grand Order
Category:Parody Noble Phantasms