Kartika

Mamori Haikasha (お守り駆逐艦) is a weapon that materializes the divinity of the witch of betrayal. It is a iridescent and jagged dagger that is thin, brittle, and blunt. It has the combat efficiency of a regular dagger, and it would not be suitable for even killing a single person. Its actual purpose is that of a key used for rituals that is described as an "indulgence from the Age of Gods that is forgiven anything for one purpose."

Its unique ability is that it is the ultimate ultimate blade when it comes to dispelling and destroying any kind of thaumaturgy. Once it comes into contact with the ensorcelled item or person, enchantments, connections bounded through contracts, and creatures created and maintained by chakra will all be returned to their original components in a state "before they were made." It is a blade of betrayal that will sever all connections between a Summoner and Summoning by destroying every single rule that controls them, giving full control of the Summoner's summoning privileges to its wielder. Humanoids bound by a contract themselves must be the target, as it has no effect on the Summoner's contract with the Summoning by stabbing the former's flesh. It is also capable of severing seals and the remote possession of a person.

All in all, it is the ultimate weapon to use against Fūinjutsu, Barrier Ninjutsu and Summoning Ninjutsu.