First of all, Youhabach's ability is not truly omniscient, but rather a "choice of the future" with a number of limitations.
To put it simply, after activating the ability, Youharbach can look at the upcoming series of futures from a high dimension, and choose the one that is most beneficial to him, ignoring the probability and forcibly turning it into reality.
There are three important prerequisites for this capability:
First, only after "watching" can he "choose", and he can't create a future he wants out of thin air (the spirit king can't do it);
Second, if it involves modifying other people's futures, then Youha must actually contact this person before he can trigger "watching" and then "selecting", and he cannot kill or resurrect an unrelated person out of thin air (this is the case with the great monk and Yijio);
Third, this is also the reason for Yuha's final death, if the ability is activated to watch a specific future, but does not do any intervention, then the system will default to Yuha's acceptance and choice of this future, once the specific conditions are completed, then this future will be forced to come.
To put it bluntly, Youha's ability is to buy a machine and choose a two-color ball, and forcibly make the probability of 1 in 10 million become 100%, and then he will definitely win the jackpot.
But he had to buy a lottery ticket to do it, and he couldn't get the $5 million jackpot out of thin air.
And Yuhabach was hacked to death by Ichigo at the end, which is the future he chooses, and the time chosen is after Hasward returns to the omniscient omnipotence.
Yuha thought that this future was a dream that Haas had shown him, so he didn't intervene in any way.
The reason why Yuha has this illusion is not that Haas deliberately cheated him, but that Yuha himself died.
Haas's omniscience and omnipotence was when he fought the rain dragon, and the future he saw was actually the result of this battle.
I was sent by Youha Shengbei and then sent.
After that, he slashed his friends, and Haas couldn't see it.
It's a very simple logic, even if you look at the future from a high dimension, it's impossible to see what happens after you die, death means that you can't activate omniscience and omnipotence, so Haas will go black directly after being stolen by Youha, so he can't see what happens afterward.
But Yuha was able to see it, because after he got his abilities back, he read Haas's archives, and then saw what happened after his own St. Biejas.
But Yuha thinks it's a false dream, and that he's misjudged Haas's loyalty.
Youha thinks that Haas sees that he will be killed in the future, so he is rebellious, but he is not able to resist, so he deliberately adds private goods and has a dream of being hacked to death by a trumpet to show Youha.
The purpose is to scare Youha, if you dare to say goodbye to me, you will be hacked to death by a trumpet.
To put it bluntly, Youha is guilty of the dirty eyes that leaders are most likely to make.
And there is one of the most crucial details here, that is, Yuha can't see the scene where Yulong shoots himself with the silver of stillness.
This is not Yulong's ability to shield Youha, although Yulong is a special exterminator, but he will not be special enough to surpass Youha, and Yulong's ability is also given by Youha, Yuha can't give others an ability that he can't control, which is the same as God creating a lump of stones that he can't move.
The reason why Yuha can't see the rain dragon is that the silver of stillness can seal omniscience and omnipotence, and can erase all related factors from Yuha's vision.
The real future is: St. Biejas - the rain dragon escapes - the still silver shooter Yuha - a chirp hacks Yuha
But what Youha saw was: St. Bejas—the rain dragon escaped—and hacked Youha to death with a trumpet
That's why Youha felt that he was hacked to death by a trumpet for some reason, and there was a lack of an important logical chain in between, so he would firmly believe that this was a false dream.
So this future was chosen and fixed by Youha, as long as a key event happened, Youha would die.
And this key event is St. Viejas, because it is from here that the reading of the Youha file begins.