
This is my theory LOL
I think river became a river god. Look at this old man forehead: http://www.mangago.zone/read-manga/the_god_of_pain_s_groom/uu/iur_chapter-54/pg-26/
look at that rivers forehead is the same as the old man http://www.mangago.zone/read-manga/the_god_of_pain_s_groom/uu/iur_chapter-54/pg-48/ HES PROBABLY BECAME A GOD, A RIVER GOD
CUTEEE! OMG!!!! THANK YOUU TRANSLATOR! You da best!~ and your cute UwU