|Debut||Digimon World: Next Order|
|Prior forms||Omegamon Zwart Defeat|
Omegamon Alter-B is a Holy Knight Digimon. The "Black Digitron" secretion, deliberately mixed in by an unknown entity, caused Omegamon Alter-S to change into this black form. Although its power is heightened while it is in this form, it comes at the price of losing its sense of self, leaving it in a berserk state.
- Supreme Sword (Garuru Sword): Launches consecutive attacks from the Garuru Sword on its right arm.
- Transcendent Cannon (Grey Cannon): Launches consecutive attacks from the Grey Cannon on its left arm.
- Grey Cannon - Rail Gun: Shoots in the shape of BlitzGreymon's plasma.
Omegamon Alter-B resembles an enhanced version of Omegamon Zwart. It has red horns and wears multiple belts on its chest, and its cape is now black and grey. Its pauldrons are larger and have golden spikes. Its BlitzGreymon and CresGarurumon heads are black and have red gems on the eyes and golden teeth, while the BlitzGreymon head has red horns, with the front horn being large and the back horns being small. It has a rhombus red gem with a golden frame on its chest, and another red gem on its waist. It also has a golden spike on each side on the waist, and a red spike on each knee. It carries the "Garuru Sword" on its right arm, and the "Grey Cannon" on its left arm; this is an inversion from the "Grey Sword" and "Garuru Cannon" of other Omegamon variants.
- Omegamon Alter-B (オメガモンＡｌｔｅｒ－Ｂ)
Official romanization given by the Digimon Reference Book and used in the franchise.
- (El:) Omega (Ω?). From I am the Alpha and the Omega (Ἐγώ εἰμι τὸ Α καὶ τὸ Ω Egō eimi to Alpha kai to Omega?).
- (En:) Alter-B.
Digimon World: Next Order
Omegamon Alter-B is a Weapon, Virus type Yellow Mega level Digimon and can DNA Digivolve from MetalEtemon and Titamon, Kuzuhamon and Samudramon and the Mega versions of OmniShoutmon and Arresterdramon. If attempted before defeating the Enforcer, this will instead result in a DNA Digivolution of Omnimon Zwart.
Omegamon Alter-B is card 540 of the collectible cards.
Omegamon Alter-B is a Mega level Digimon that digivolves from Omegamon Zwart D.
Omegamon Alter-B is a Jogress level Digimon that digivolves from Omegamon Alter-S.
Omegamon Alter-B is an Ultra level Digimon that digivolves from BlitzGreymon.
Notes and references
- Omegamon Alter-S is a Jogress Digimon in Digimon Masters and an Ultra Digimon in Digimon ReArise.
- Digimon World: Next Order, "Chapter 4" 
- Digimon World: Next Order: Omegamon Alter-B: Omegamon Alter-S lost its identity and went out of control after being injected with Black Digitron
- This attack is named "Garu Sword" in Digimon Masters.
- This attack retains its original name of "Grey Cannon" in Digimon Masters.