Kiana Kaslana Vs Irontomb
Cocoon Of Finality Kiana
Attack Potency: Hyperverse Level
Durability: Hyperverse Level
Lifting Strength: Immeasurable
Complete Irontomb
Attack Potency: Hyperverse Level
Durability: Hyperverse Level
Lifting Strength: Universal
Fight takes place in Amphoreus
Fight OST:
For me, Kiana wins (I'm not going to talk about the scales, which I think are flawed).
Iron Tomb's objective is to kill and absorb Nous (that's a rough summary), except that in the video about the multiple endings of Hoyoverse, the best ending for Iron Tomb is the one where he absorbs the Great Herta, who is an emanator, so even in his best ending, he doesn't reach Nous.
Many believe this is enough to defeat Kiana because of the argument made by the person from the Garden of Remembrance.
She speaks of Kiana's energy fluctuations and says they are emanator-level. However, at that moment, Kiana was asleep and therefore in a dream, and her power was scattered, far from complete. Even so, simple power fluctuations were emanator-level, meaning Kiana is much stronger than emanators.
Next, Kiana Herrscher's ultimate power is equal to the cocoon, even though she doesn't yet fully control it.
It's also stated that the Paths are amalgams of imaginary energy, and Kiana manipulates all of this imaginary energy, making her superior to the Paths themselves.
There's also the argument about the end of the universe in Iron Tomb. In the Chinese version, the pinyin used is for galaxy, not universe. Even in the game, we see that it doesn't destroy but extinguishes the stars of a single galaxy. Therefore, the entire story takes place in the same galaxy, meaning Iron Tomb extinguished several galaxies, which doesn't change much regarding the feat; they are still galaxies. Then there's the universe. According to Zandar, the universe resembles a tree, so we might think it's the imaginary tree. However, what he says in the theory refers to the workings of bubble worlds, so it's definitely not the imaginary tree, far from level 12D.
Regarding the Iron Tomb, the last chapter of the second part of Hi3 reveals that certain parts of the SoQ have an advantage over the Iron Tomb, and vice versa, meaning the two structures are relative. Therefore, the SoQ is not dimension 11 but 12. Furthermore, I remind you that Durandal can use the SoQ as an energy source; he doesn't use it directly. Thus, Durandal is equal to, or even superior to, the Iron Tomb, and Kiana defeats it.
Moreover, Kiana is no longer inside the Iron Tomb; its destruction therefore does not affect her, and she can consequently destroy it as well.
Other arguments are possible, but these are sufficient to assert that Kiana is superior to the Iron Tomb.
Therefore, I vote for Kiana.