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U Mos crop
U-Mos, in the Great Temple.
Species Luminoth
Homeworld Aether
Born 2.15 centicycles prior to events of Echoes
Gender Male
Eye color Red
Affiliation Sentinel of the Luminoth
Do not be afraid. I am U-Mos, Sentinel of the Luminoth. Please listen, and hear of our world's peril.


U-Mos is the fifth Sentinel of the Luminoth, born from the third sentinel, V-Mos. When the Ing conquered much of Aether, he ordered all the surviving Luminoth into the Great Temple to enter cryogenic hibernation and await the end of the crisis. Samus accepted U-Mos's plea for help, restored the Light of Aether to the four temples and defeated the Ing.

U-Mos is 2.15 centicycles old. Luminoth are suggested to live for nearly 5 centicycles, making U-Mos roughly middle-aged by human standards. He is suggested to have many abilities that would aid him in combat. However, like most of Samus's allies in the Metroid series, U-Mos guides Samus to her destinations without actually going with her; U-Mos must stay behind to protect his sleeping brethren.

U Mos close up


It is possible that U-Mos is one of the most well-defended characters in a Metroid game: if Samus tries to attack U-Mos, he brings up a psychic force field which deflects every weapon in Samus's arsenal, and he also has telekinesis and can fly. He can produce holograms in his hands, a power that all sentinels share. His offensive capabilities are unknown, but it is known that the Luminoth's ability to generate and manipulate energy is on par with the Chozo.

U-Mos was presumably able to protect the Great Temple for a large amount of time prior to Samus's arrival, meaning he likely has enough power to fight off legions of the Ing single-handedly. However, he was not able to launch any major offensives against the the Ing on his own, since he had to wait until Samus arrived to restore the Light of Aether.

Logbook entryEdit


  • In Metroid Prime: Episode of Aether, U-Mos appears toward the end of chapter four after Samus and Miguel Luis Garcia have killed a second Dark Alpha Splinter, telling the "guardians of light" he has awaited them. As in the game, he informs them of the episode of Aether, and seems to know about Dark Samus, stating that she is an "evil mind". At the end of the manga, he is seen telling the Luminoth children the story of how Samus, Miguel, Lily Thran, Klaus Schneider and Jeff McCloud saved Aether.
  • When Samus isn't standing near him in the Great Temple, U-Mos will periodically raise one arm and generate a small orb of light, attracting the many moths buzzing around the chamber.


Preceded by:
Sentinel of the Luminoth
Succeeded by:

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