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[[Image:X_antibody.png|150px|right|thumb|Picture of the X-Antibody]]
The '''X-Antibody''' (X抗体 ''X-Koutai'') is a vaccine that makes Digimon immune to the [[X-Program]]. Digimon that are introduced to the X-Antibody undergo a change in physical appearance (e.g. crystals emerging on various parts of a Digimon's body) and usually become more powerful than their previous, non X-Antibody counterparts. Some Digimon already have the X-Antibody present within them.

==Project Ark==
When the Digital World reached its maximum capacity, the host computer of the Digital World, [[Yggdrasil]], was unable to manage this. Its solution was to eliminate the vast majority of the Digimon with the X-Program, and select a very small percentage to be moved to a new Digital World, and destroy the old one. Those who were not chosen but still survived and moved to the new world due to their [[Digicore]]s being altered to resist the X-Program, forming the X-Antibody as a consequence. 
The X Digimon fled to a [[New Digital World|new Digital World]] which was split into three terminals consisting of '''Ulud''' (a misspelling of ''Urd''), a past plain which is a volcanic wasteland, inhabited by Dinosaur type and draconic Digimon, '''Versandi''' (a misspelling of ''Verdandi'') is the "present" region which is a world of lush greenery and is home to beast, bird, plant and other nature Digimon, and '''Skuld''' is the "future" region, a high-tech city where machine and insect Digimon inhabit. Yggdrasil sent the [[Royal Knights]] to eliminate the X Digimon.

==Appearances==
===Digimon Chronicle===
===Digital Monster X-evolution===

[[Category:Terminology]]
[[Category:X-Antibody Digimon| ]]