Been thinking about the upcoming Chao sparring match and noticed an interesting detail in the code.
If you let the devil take control during the Spear Twins 3v3, he cripples a Xiantian by obliterating his arm when he tries to stop the MC from killing the Twins. Now this happens regardless of whether you learned the Realm Annihilating Fist or not, but interestingly enough that scene is tagged as xiantian_realm_fist, so the devil essentially uses the technique to blast through the Xiantian. That is also confirmed by the fact that your attributes decrease by 10 after.
But in the code, using the Fist decreases your attributes by a bigger amount after each use (2*realm_fist_used) so if you use it for 3 times it decreases your attributes by 6 in addition to 2 and 4 from before.
Now I don't know if Niki arbitrarily threw that in there or not, but if not, it implies that the Devil somehow made the attack even more powerful at the cost of more stat decreases. And it also means that the Devil knows how to use the fist automatically.
In my mind, it just confirms that the Devil is either Tang Wei's or has access to many if not all of Tang Wei's buried memories that the MC hasn't seen yet. And if it is like
@Arlonb said, and the RAF is basically equal to a Nirvana level spell, then it should be able to basically just blast through and one shot everyone on the PoMA world without issue.
Even Yichen...
Though I suppose why Niki added the charge time to it as well as the stat decreases, so someone like Yichen, Bohai, Chao etc. , can just react much quicker than the MC can finish charging it up.