I am wondering , if MC had such a face changing technique , then why didn't he used it in past. 🤔
It could have saved him from a lot of troubles

He did, he just didn't have strength to use it until now.

He probably wouldn't use it here either, but in novel there were around 100 ppl in this room and almost everyone is an enemy. Animation usually takes shortcut to show much less ppl than in novel as it would mean whole new level of scene complexity. Like, when they entered this realm, there were 1000+ ppl in novel. In animation there were 20? 30?

Because of this mass of enemies here, he will choose to steal everything in front of their eyes

it has nothing to do with his strength stop pulling shit out off your ass.
in book it changes his face just a little, enough so people who doesnt see him from close before cant recognise.
an Only a small fraction of those 100 people enemy of mc. the rest are from weak kingdoms who doesnt even saw him.
most of them not even martial king mc can kill them with his fart.

Hmmmm.... I think he doesn't like to avoid troubles at all!!! He might just be playing around this time just for the fun of it! I can sense the serial killing-without-mercy MC machine coming up next ep though... He likes to bash pretentious bastards and giving them a good beating/killing!

True talk

At this point in novel he still avoids it. His problem is that at this point he keeps it low key until he gets strong enough for revenge. Not to mention, 100 enemies is too much, especially when you consider there are their ancestors here too. He would provoke whole continent if he did that. Last thing he wants is for his two enemies to learn about his revival because his former skills are too obvious

He becomes like what you say after revenge once in divine realm. He actually becomes even worse than that and almost masturbates on it

XD