Time Stop, Light Manipulation, and Reality Warping, Life Manipulation (already on his profile).
When he got Suniaster, the first thing he did was stop everything including time and then recreate the world.
Then slowly...held over the [Star Grail] with his hand, and then------------......
■ ■ ■ ■ ■
That view, everyone in the world witnessed.
Therefore, that was, one of the very few things of this history, that was left recorded as a historical fact...
----First, light engulfed the world.
The light that expanded in the far away horizon, covered the red heaven and dyed even the land in white, and stole the boundary of heaven and earth.
When the light that expanded soundlessly stopped----the world, had lost its color.
Everyone felt troubled in differentiating the heaven from earth, and then, in the space of one beat they noticed.
The ash that danced in the sky stopped in space, the fires of war forgot to flicker, and any and all things stopped.
----Even the time. Everything, besides those who possessed life.
While being silenced by that view, leaving behind the life and the living ones, in the space of many instants.
----A impact engulfed the world.
It was clearly different from destruction----a gentle power passed through as if licking the world.
At the same time, the ones who looked up to the sky----opened their eyes.
A view that missed the normal course----all living things, and races just gazed at that while still not understanding it.
Source: Vol 6 Chapter 5
Sound Manipulation
His voice reached throughout the heavens and across the earth.
"All right. With that-"
With these words, the weakest and last Old Deus held out the Suniaster and proclaimed in a voice that reached throughout the heavens and across the earth:
O Ixseeds that claim yourselves wise
And so the myth that would never be sung continued into the myth that still is told. That is:
By the vow of achéte and the bonds of aschent,
the One True God, on his ascente, setteth forth the Ten Covenants. Which ye shall heed. For this day, today, the world hath changed.
-Aschente!!
Source: Vol 6 Chapter 5
Resistance to BFR
Old Deus could easily break out of the pocket space
It was clearly overkill against one of the other races. However, deploying this ultimate attack on an enemy larger than oneself would be pointless. It only worked here because Azril had vastly more power than Jibril—enough to seal her off in a separate dimension. Beings stronger than Azril—such as Phantasmas, Dragonias, and Old Dei—could easily break out of the pocket space, rendering the attack useless.
Source: Practical War Game - High Card All Raise Part 2
Possible Plot Manipulation or Text Manipulation
Tet with his book wrote set the storyline of Kuuhaku's journey.
“Please don’t make me wait too long, Blank.”
He kicked the edge of the piece he was sitting on with his heels.
“I can hardly stand it anymore. If you make me wait too long—I’m going to have to visit you, aren’t I?”
Twisting his mouth into an impudent grin, he whispered:
“Oh, that’s right. Next—”
Apparently having thought of how to continue his story, Tet twirled his quill.
“‘One day, a pair of gamers was invited from another world to a country of Immanity, the lowest-ranking race among the Ixseeds. Coming to the last bastion of beleaguered Immanity—to Elkia—they defended it from other races and became the king and queen—and that is where everything started’… I like it!”
—The scribbles he wrote, now a story, would soon be an epic passed down among the bards for generations. Penned by the hand of the God himself, foretelling the gods to come. In other words: the prologue to the newest myth—.
Source: Prologue Vol 2
Immortality (Type 9)
The physical body Old Deus or Quintessence that exists physically is only a puppets or avatar so that it can exist in the physical realm. Like Holou's explanation where she is a multi-dimensional entity. The true "Quintenssence" as well as Old Deus' true form, exists in a higher dimensions.
Holou’s true form isn’t that girly appearance, after all.
“I am Holou’s Quintessence”
“.............eh. You mean... that ink pot you were always on?”
“—Nay. That is not accurate either. What thou saw as an ink pot was simply an image of my divinity that thou could comprehend. In the fist place, Old Dei don’t have true physical body. This ‘puppet’ is nothing more than a virtual image used to communicate my will—”
Source : Vol 8 Chapter 4
…You’re still caught up in that~? And I keep telling you the ‘one who calls himself’ is unnecessary!”
“……? However, the components that define the individual called ‘Sora’ are variable, right? Therefore, the
dimensional point of reference of the ‘Sora’ that acknowledged Holou; and thy, ‘the one who is assumed
to be Sora’’s current dimensional point of reference are different. That makes thou just ‘Someone who
calls himself Sora’! In that case, can the simple-dimensional intelligence that defined Holou as Holou,
‘Sora’, define all the extra-dimensional points of Holou, who is a multi-dimensional intelligence.
“Ack, you are troublesome beyond imagination, you know!?”
Source: Vol 8, Ideal Ending
The Ex-Machina can adapt infinitely over and over and become infinitely strong… however, they can never reach someone who is the strongest relative to everyone else. Even if they can adapt infinitely, transcending the concept said to be the strongest… transcending the absolutely strongest is theoretically impossible.
“Therefore, while he was on a higher dimension… we only destroyed the Quintessence that physically existed ── However.”
By doing that the manifestation of Artosh’s concept would temporarily stop ──
Vol 8 chapter 4
Abstract Existence (Type 1)
Tet is metaphysical and physical embodiment of concept of games.
Ed: Added Immortality and Abstract Existence