Do not be afraid. I am U-Mos, Sentinel of the Luminoth. Please listen, and hear of our world's peril.


U-Mos is a major ally and character in Metroid Prime 2: Echoes.


U-Mos is the fifth Sentinel of the Luminoth, and the son of the third sentinel, V-Mos. After the Ing conquered much of Aether and claimed most of its planetary energy, U-Mos realized that his people were fighting a losing war and ordered all the surviving Luminoth to enter stasis in the Great Temple to await the end of the crisis. As he watched over his hibernating people, U-Mos prayed for salvation to come for his people.

Eventually, that hope would come in the form of the mercenary Samus Aran, whose Power Suit had been infused with the Energy Transfer Module. When she arrived in the chamber housing the Great Temple's Energy Controller, U-Mos approached Aran and explained the Luminoth's plight and pleaded for her help. She accepted his plea, and with U-Mos's guidance restored the Light of Aether to the four temples and defeated the Ing.

U-Mos is 2.15 centicycles old. An Aether cycle is equivalent to 3 earth years, meaning U-Mos would be 645 years old.[1] 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, as he must stay behind to protect his sleeping brethren.

Powers and abilities[]

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 except A-Voq are shown to have. 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 Ing on his own, since he had to wait until Samus arrived to restore the Light of Aether.

Official data[]

Logbook entry[]


Metroid Prime 2: Echoes

Temporary scan

Morphology: Luminoth (U-Mos)
Indigenous sentient species of planet Aether. Subject is U-Mos, a Sentinel of the Luminoth, guardian of his species and this sacred temple.

Logbook entry

Subject is U-Mos, a Sentinel of the Luminoth. Scans indicate numerous beneficial abilities, including heightened reflexes, durability, psionics, and flight. Ability to generate and manipulate energy on par with that of the Chozo. Dating scans suggest an age of 2.15 centicycles. Only known active member of the species; remaining Luminoth locked in protective stasis until crisis is resolved.


Initial dialogue
"Do not be afraid. I am U-Mos, Sentinel of the Luminoth. Please listen, and heard of our world’s peril.
Long ago, a cosmic object fell to our planet, Aether, exploding with great force. A rift was torn in time and space, and a strange power flowed over the world.
Where once there was one Aether, there were now two. One of light…and one of shadow, each existing in its own dimension.
It was the end of peace on Aether, for a new race was born that day on the dark world…one filled with hate and terrible power. They are the Ing.
The Ing are creatures of shadow and darkness, knowing nothing of peace or mercy. For decades, we stood against them…yet we now lie on the verge of defeat.
When Dark Aether was born, our planetary energy was divided. Half for our world, and half for theirs.
Should one world gain control of this energy, the other will perish.
Before you arrived, the Ing had stolen a device from us…one that collects planetary energy. With it, they have weakened our planet to the verge of collapse.
But fortune smiled upon us this day, for the Energy Transfer Module…is now bonded to you. With it, you can help us…help us restore our world.
You’re our only hope, Samus.
Should we fall, the Ing will look to the stars for new planets to ravage and conquer. Your species could be their next victims.
The Ing have taken our energy to three temples on Dark Aether. Find these temples, and transfer the energy from them to our own.
I have updated your map system with the location of another temple. There is knowledge there that can help you on your way.
I have also updated your Translator Module. You can now access devices and doors coded with Violet holograms. Many lands are now open to you.
Prepare well for your journey. The Ing now know you possess the Energy Transfer Module. They will try to recover it at all costs.
Return to me once you have restored the energy to a temple. I will aid you as I can.
May the Light of Aether shine upon you!"
(If spoken to again)
"The temple in Agon's dark shadow holds what you seek.
Return the missing energy, before Agon is lost forever to the Ing."
After Agon Wastes
"I thank you for restoring energy to the Temple of Agon.
Your valor honors the Luminoth…those who have passed, and those who remain…here, under my protection as they sleep in deep stasis.
Be on guard, for the Ing do not suffer defeat lightly. They will surely seek revenge for your actions.
With the energy lost from the desert region, they will increase their efforts in other lands.
I have detected unusual amounts of Ing activity in the Torvus sector. The enemy is on the move.
The swamplands of Torvus are treacherous, and can hinder you considerably. Bear this in mind as you move through the bog.
Seek the Temple of Torvus. More knowledge awaits you there.
May the Light of Aether serve you well!"
(If spoken to again)
"The temple of Dark Torvus holds more of our precious energy.
Return it to us and restore life and order to the Torvus Bog."
After Torvus Bog
"The Temple of Torvus glows with energy once more. Only one temple remains without the Light of Aether.
You must travel to our fortress, high in the cliffs.
The last temple lies in the fortress. Seek knowledge there before invading the Ing Hive.
Be cautious in the fortress. This place was once guarded by machines of our creation, but now they are corrupted slaves of the Ing. They will not see you as a friend.
Our goal draws ever closer. Let the Light of Aether be your guide."
(If spoken to again)
"You have weakened the enemy forces in Torvus. The Ing now fear and loathe your name.
Do not relent. Press on! Show the darklings in Sanctuary no quarter!"
After Sanctuary Fortress
"The Light of Aether shines from all three temples once more.
And yet, Dark Aether remains. One Energy Controller still shines in the darkness, sustaining the world.
The Sky Temple, dark shadow of this hallowed place, holds the final Energy Controller. The greatest and most powerful beast of the Ing keeps guard over what you seek.
The nine keys to the Sky Temple have been hidden in each land of the dark world. Finding them will be perilous, but…
…I offer you this blessed suit of armor, energized by the Light of Aether itself. Its power will help you reach these final keys.
May it serve you well in the darkness!"
(If spoken to again)
"The last stronghold of the Ing remains. Seek its nine keys to gain entry.
Once you reach the Sky Temple, let nothing stay your hand!"


  • 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 is not 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 fluttering around the chamber.



Preceded by:
Sentinel of the Luminoth
Succeeded by: