Am i right in believing that said "demon lord", patrich of the demon fist, sect is somewhat related to yan quin wu and also in fact a human or at least half human like the elefantboi said when engaging him. Also seems like he is very restricted in where he can use his "powers" since he didn't come out to fight for an eternity despite being supposedly the strongest being on their continent from what he displayed when showing upwhich makes a negotiation unreasonable unless he does in not want humans in that area to be annihilated and in fact accepted a negotiation with terms very beneficial to the human side. [hardly loosing any territory not being attacked while leaving those (?) they handed over and forcing a period of peace]
Now the humans surely won't attack until the treaty expires and no demon will dare go against the demon lords decision since he was the one who subdued all potential representative leaders of the 10 Demon Territories with overwhelming strenth before going to the battlefield and taking on all Apex Experts of the 100 Sects and forced a temporary end to the war.