DexDoruGreymon

DexDoruGreymon is a Ghost Digimon and a carrier of the X Antibody. An Undead Digimon of the Prototype Digimon "DORU Series" that was experimented on in search of further digivolutions, and was said to, at the time of the experiment, resemble its final form. Since it keeps preying on the Digicores of other Digimon, it is active despite its deceased condition, and is seeking a massive Digicore in order to digivolve. As it instinctively hunts for Digicores, the eye portions of its head and snout are covered in armor, and the sharp tips of the blades on its tail and wings are used to skewer many Digimon and then prey on their Digicores.

Attacks
 * Bloody Cave: Attacks the foe with the armoured spike on its head.
 * Metal Meteor: Summons a giant sphere of metal ten times its size and shoots at its foe.

Etymologies
Official romanization given by the Digimon Reference Book and used in Japanese and some American English media. English media format "DORU" without the capitalization.
 * Death-X-DORUguremon (デクスドルグレモン)
 * Death-X.
 * From D IGIMON OR U NKNOWN-MONSTERS.
 * (Ja:) Gure. Romanization of "gre" which may come from.

Name used in most American English media.
 * DexDoruGreymon
 * (Ja:) Death-X, directly from "Dekusu" (デクス).
 * From "DORU" but without the capitalization.
 * (En:), meaning "old" or "ancient".

Digimon Battle
DexDoruGreymon is the ultimate form of Dorumon, digivolves from DexDorugamon at lv.31, and can digivolve to DexDorugoramon.

There was also a "Rent a Mutant Dorimon!" event in which an NPC gives a special Dorimon whose Digivolutions are Dorumon, Guardromon, DexDoruGreymon, and Raijinmon.

Digimon Masters
DexDorugreymon is an Ultimate-level Mercenary Digimon that digivolves from DexDorugamon and can digivolve to DexDorugoramon.

Digimon Heroes!
Death-X-Doruguremon digivolves from Death-X-Dorugamon and can digivolve to Death-X-Dorugoramon.