Umbras are the strongest versions of the shadow monsters, appearing only in places filled with darkness. As its Japanese name states, they are shadows of deceased Demon Lord themselves given physical form. The official guide book for the Super Famicom version of Dragon Quest III states that they are the malicious intent of Baramos given semi-physical form. With its high agility, it can become a nuisance to adventurers with its instant death spells and sickly sweet breath. Thankfully, they are vulnerable to having their magic sealed away with Fizzle. Although its shadowy ilk appeared in VI and VIII, umbras themselves did not make a reappearance in the series until X and XI, as well as various spinoff games.
Long ago, the shadow of a great demonic lord was endowed with magic and took on a life of its own. It multiplies by devouring the souls of its terrified human victims
Umbra appears as an A-rank monster of the Inorganic family as part of the limited Dragon Quest III event. It will join the party in Chapter 5, Episode 3: Baramos? of the event quests and it can be fully awakened by completing the quest at any difficulty. The umbra can participate in Skelegon's Battle Road as a party member.