Umon

Umon is a tiny dragon Digimon sealed within Goldramon's left. It is called Umon of the Blue Lightning (蒼雷のウモン), and governs over "Regeneration".

Design
Umon appears as a mass of black energy in the shape of a dragon.

Etymologies
Name given by the Digimon Reference Book. No official romanization available.
 * Umon (ウモン)

Digimon ReArise
uses Umon to heal a fatally wounded due to Sagittarimon managing to reform  from a Digimon who only destroyed to a Digimon who wishes to protect.