ETERNALS OF EYUNG
Classification: Extraterrestrial humanoid Eternal race
Location/Base of Operations: The planet Eyung (aka Eternus), now destroyed, formerly somewhere in the Andromeda galaxy
Known Members: Grom;
unidentified leader; unidentified warlord;
all citizens live on in the
composite mind of the Over-Mind (Grom)
Affiliations: None known
Enemies: Gigantans of
Gigantus;
numerous other unidentified races they conquered, enslaved, and/or destroyed
Aliases: The Eternians, Eyungians
First Appearance: Fantastic Four I#115 (October, 1971)
Powers/Abilities: The Eternals (also called Eyungians or Eternians) were extremely long-lived.
They did not demonstrate superhuman abilities, but they
likely had abilities comparable to the pre-Kronos mutated Eternals (see comments).
Savage and powerful warriors, they sometimes wore powerful armored suits.
Some native were strong and skilled enough to overpower creatures over twice their size.
They possessed vast technology.
Amongst their technology were several interstellar fleets, an Interstellar Beamer, anti-matter Reaction Bombs, the Synthesizing Chambers, and other unrevealed forms of technology.
Traits: The Eternals of Eyung were human-looking in appearance.
Despite their technology, they remained
savage, cruel, bellicose, and imperialistic.
The Eyungians valued strength and combat ability above all else, and they lived to conquer, enslave, and destroy.
For recreation, they enjoyed gladiatorial-type combat via the Games.
They used defeated
populations as slaves. 
History:
(Fantastic Four I#115 (fb) / Official Handbook of the Marvel Universe I#8: Overmind entry / Quasar I#16 (fb))
- Eyung was a ringed planet in the Andromeda galaxy.
(Quasar I#16 (fb)) - Apparently at some point the Celestials visited the world (see comments) that
would become known as Eyung, experimenting on its natives and
diverging three races, a baseline normal, Deviants, and Eternals.
The Eternals apparently became the dominant race (see comments).
(Fantastic Four I#115 (fb) / Quasar I#16 (fb))
- Eyung developed into "a place of primitive savagery
--rampant, unchecked-- yet existing side by side with science and
technology to stun the senses!"
Though having mastered science and being unaging and immune to natural death (see comments),
their savage
natures drove their race to war. Endlessly battling, destroying,
and enslaving other planets and races.
They were never known to lose a battle, nor had Eyung ever been attacked.
"Before the Eternals, planet died...and a universe wept!"
"The Eternals wrote their name across the stars in the flames of dying world"; they enjoyed the spoils of victory.
(Fantastic
Four I#115 (fb) - BTS) - Eyungian scientists discovered a means by
which they could transfer their collective psychic power into a single
Eyungian.
However, as they seemed to rule the stars, they had no use for this "Final Project"
(Fantastic Four I#115 (fb)) - When the Eyungians weren't waging war, they engaged in
arena-style Games that pitted their greatest warriors against men and
beasts while public crowds watched.
After the Eyungians'' scouts failed to find
a planet worthy of conquest in ages, the Games continued.
In the greatest game, Grom, a powerful conqueror and gamer, was pitted against a fully armed battalion of slaves and won, and thus Grom was named the Champion of Champions.
(Fantastic Four I#115 (fb) - BTS/ All-New Official Handbook of the Marvel Universe#6: Over-Mind entry) - The Eternals of Eyung were long-watched by the peace-loving Eternals of Gigantus, an immense Dyson Sphere.
(Fantastic Four I#115 (fb) / Quasar I#16 (fb)) - The war between the Eyungians and Gigantans lasted millennia, with countless casualties.
(Fantastic Four I#115 (fb)) -
Eventually, the Eyungians realized that Gigantus was too large too
conquer, and that the Gigantans were progressively growing more skilled
in warfare.
As the Eyungians suffered greater numbers of defeats, they
chose to instead destroy what they could not conquer.
(Fantastic Four I#115 (fb) / Quasar I#16 (fb)) - Fleeing
Gigantus, the Eyungians launched a series of anti-matter Reaction
Bombs, starting a chain reaction that would destroy it.
(Fantastic Four I#115 (fb)) -
Vowing retribution, the Gigantans launched a vast armada that soon
attacked Eyung.
Though the Eyungians' leader was
certain that their defenses would repel and destroy the attackers, the
Gigantans also struck with Reaction Bombs.
As the leader gave the order to begin, the brain-power of all surviving
Eyungians was harnessed and transferred into Grom, "the power of a
billion brains synthesized into one! One mind to carry on for us -- to
triumph, to avenge!"
Comments: Created by Stan Lee, Archie Goodwin, John Buscema, and Joe Sinnott.
Read the Grom/Over-Mind profile for the history of the Eternals of Eyung who lived on in Over-Mind's form.
Subsequent comments in blurple by Snood:
Originally, the planet was not identified, and it was just shown as the
world of the "Eternals."
In the original Official
Handbook of the Marvel
Universe Deluxe Edition#8: Overmind entry, it was called Eternus.
The
world's name was later retconned to Eyung in the Official Handbook of
the Marvel Universe Master Edition: Overmind entry. It was confirmed as
Eyung in Quasar I#14-16.
I think the handbooks called them Eternians,
presumably to distinguish them from the Celestial-created Eternals.
It's interesting (to me) that it was Mark Gruenwald who was in charge
of the handbooks that first went with the name Eternus, and it was also
Gru who who confirmed them to be Celestial-created Eternals, as were the
Gigantans, in Quasar I#14-16. In the original story, the "Eternals" were
described as having mastered aging and natural death via their mastery
of science.
As Chad noted in the original comments, the development of a group mind
like the Over-Mind has interesting similarities to the Eternals'
Uni-Mind, even before the Eternals of Eyung were confirmed to be
Eternals like the Eternals of Earth.
Eyung's galaxy was described by the Watcher as being ancient when the
stars of the Milky Way were
aborning. At least as early as the original OHotMU entry on the
Over-Mind, this galaxy was defined as the Andromeda galaxy. I'm not
sure of the relative ages of the Milky Way vs. the Andromeda galaxies;
an internet search gives a lot of contradictory information, and I
don't know where to go to get the definitive answer.
As the dominant race was called Eternals, we can extrapolate that they were the result of experimentation by the Celestials, and that there were likely Deviant and baseline normals at some point, as we've seen with many other races, including the Skrulls.
If the Eternals enslaved other populations and traveled to other
worlds, it seems EXTREMELY likely that they would have had members of
the race off-world when the Gigantans destroyed Eyung. It might be
interesting to see the Over-Mind encounter other surviving Eternals of
Eyung after long claiming to be the last of his people.
Also interesting is that they allegedly didn't age, but we see some of them appearing older than others; take their ruler, for example.
Additional images of Eyungians are present in the Over-Mind profile, as
well as images of Grom's gladiatorial combat and his space capsule,
spore, etc.
Profile by Chadman;
updated/expanded by Snood
Clarifications:
The Eternals of Eyung should be distinguished from:
Above all else, the Eternals of Eyung valued their incredible strength and fantastic fighting skills.
They held barbarous contests to prove their superiority to all challengers, man or beast.
(Fantastic Four I#115 (fb)) - When the Eyungians weren't waging war, they engaged in arena-style games that pitted their greatest warriors against men and beasts while public crowds watched.
After the Eyungians'' scouts failed to find
a planet worthy of conquest in ages, the Games continued.
The Games concluded with the selection of the Champion of Champions.
Grom, a powerful conqueror and gamer, was pitted against a fully armed battalion of slaves and won.
Thus Grom was named the Champion of Champions.
--Fantastic Four I#115
Note: There are additional images of the gladiators and Games in the main image, and Grom and his combat are shown in the Over-Mind profile.
As the Eternals of Eyung were immortal, their leader may have ruled at the time the decision was made to first attack Gigantus and possibly long before.
Regardless, he was the ruler at the point millennia later when they decided that Gigantus was too large to conquer, after which the Eyungian forces retreated and then destroyed Gigantus with Reaction Bombs.
When the massive Gigantan armada assaulted Eyung, the leader was initially in denial, as Eyung had never been attacked before, and he was certain no one would dare.
Forced to accept the fact as the Gigantan ships darkened the skies, the leader nonetheless remained confident that their defenses would repel and destroy the Gigantans.
However, his base and the world of Eyung itself soon shook under the assault of the Gigantans' own Reaction Bombs, and Eyung's imminent demise was soon apparent.
Vowing that the spirit of the Eternals would not
perish, the leader ordered the summoning of the scientists royal and to gather
everyone for the Final Project. As Grom stood ready in a receiving
chamber, the multitudes of Eyungians stood ready in synthesizing
chambers all over the globe.
As the leader gave the order to begin, the brain-power of all
surviving Eyungians was harnessed and transferred into Grom, "the
power of a billion brains synthesized into one! One mind to carry on
for us -- to triumph, to avenge!"
Before that power could reach fruition, however, there had to be an
ages-long incubation period. The leader had the Over-Mind was transferred to the
interstellar beamer, which fired him into the trackless void beyond the
galaxies until.
It was the Eyungians' leader who first prophesied that one day, "From beyond the stars shall come the Over-Mind -- and he shall crush the universe!"
--Fantastic Four I#115
Note: The leader ruled from Eyung, but there was a different Eyungian, presumably a warlord, who seemed to make the decision that the war against the Gigantans could not be won. He presumably reported to the leader, although the leader seemed so stubborn it is hard to believe he would have given up in attacking the Gigantans.
It MIGHT be a younger version of the leader being saluted by those about to participate in the Games.
Anti-matter weapons, Reaction Bombs embedded themselves deeply within a planet's surface, ultimately setting off a chain of ever-mounting explosions that would eventually end in total destruction.
(Fantastic Four I#115 (fb) - Having attacked
the immense Dyson Sphere known as Gigantus millennia before, the
Eternals of Eyung eventually realized it was too massive for them to
conquer.
What they could not conquer, the Eyungians were determined to destroy, and so in retreat they dropped a number of Reaction Bombs on Gigantus.
Realizing their world's fate, a vast Gigantan armada departed Gigantus, which was destroyed soon thereafter.
Seeking vengeance, the Gigantan armada attacked Eyung, unleashing their own Reaction Bombs.
Now seeing their own imminent demise, the Eyungians transferred their mind-power into their own Grom, who would become the Over-Mind, and launched him into space to incubate and adapt to the power.
(Fantastic Four I#115 (fb) - Eyung was destroyed.
--Fantastic Four I#115
Note: As far as I can tell, they weren't noted to be using anti-matter until Quasar I#14-16
(Fantastic Four I#115 (fb) -
BTS) - Eyungian scientists discovered a means by which they could
transfer their collective psychic power into a single Eyungian.
However, as they seemed to rule the stars, they had no use for this "Final Project"
(Fantastic Four I#115 (fb)) -
Seeing their planet was doomed, the Eyungians's leader vowed that the
spirit of the Eternals would not perish.
He ordered the summoning of
the scientists royal and to gather everyone for the Final Project.
As
Grom stood ready in a receiving chamber, the multitudes of Eyungians
stood ready in synthesizing chambers all over the globe.
As the leader gave the order to begin, the brain-power of all
surviving Eyungians was harnessed and transferred into Grom, "the
power of a billion brains synthesized into one! One mind to carry on
for us -- to triumph, to avenge!"
--Fantastic Four I#115
images:
Fantastic Four I#115, pg. 3, panel 3 (main image);
pg. 4, panel 1 (scientists);
panel 2 (attacking another world);
panel 4 (enslaving captives);
pg. 5, panel 1 (Games warriors saluting their lord);
panel 2 (warrior battling reptilian creature);
pg. 6, panel 1 (slaved preparing to battle Grom in the Games);
panel 6 (Grom becomes Champion of Champions);
pg. 10, panel 5 (warlord realizes they can't conquer Gigantus);
pg. 11, pg. 1 (Reaction Bombs);
pg. 12, panel 6 (leader & advisor, distant);
panel 7 (leader & advisor; faces);
pg. 13, panel 5 (Grom in receptacle);
panel 6 (Synthesizing chambers);
pg. 14, panel 1 (mental power transferred into Grom);
panel 5-6 (Over-Mind transferred into Interstellar Beamer & launched);
pg. 15, panel 1 &2 (Grom incubating, spore forming)
Any Additions/Corrections? please let me know.
Non-Marvel
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The 
Reaction Bombs
