for like half the chapter, i thought it looked like a Genki Dama from Dragon Ball, but after seeing how it turned out near the end, it actually feels more like Sasuke’s jutsu : Kirin or more like Enel skills from One Piece
"Whoah, all the spirits are cheering me on..." Shows image of a crowd of spirits doing so "SHUT UP! This is too much pressure, and it's so distracting!!"
I was expecting it to do something like this, because the story has been so self aware and humorous so far.
a bit less cliche outcome coulda been he failed but set up conditions for the thing to get submerged in a muddy sinkhole/quicksand. effectively disabling it for a long long time letting the spirits deal with it at their leisure.
... or the power of hate and spite letting him figure out a neat trick with water, ever get a cockroach wet then put it into a microwave? the resulting steam causes it to pop apart... if you put in dry you just get a roach disco in your microwave.
Thought he was going to compress the water more and more until it would become so pressurized it slice the automoton right in half, but in retrospect it makes more sense they went with a cloud- why else would he try the 'mist' trick