I mean, I'll stick around for another chapter or two to see if it gets better, but I genuinely hate the whole 'MC gets betrayed by his party' trope. It's one of the most generic and overused cliches ever.
I think the only time I liked the setup of this premise in recent times is in 100 Exiled Worlds... kinda proves you can have this setup and still make it into something fun and engaging.
Okay, but like... why did they even wait to kill him? Just for the abyss? Why even draw it out until literally the very end?
Prolonged suffering of such lengths is stupid when everyone clearly wants the MC dead
"we are going to toss this guy down there... the guy who can control the dead and perhaps become a death god. so good we are going to kill him right there where he will become so much stronger. hahah i am A GENIUS!" later we see his undead corpse doing humilating work