I'm honestly surprised that it's ending the. "Do you want power?" and summoning last chapter with all the new characters was really funny and the best this manga's been for a while. Good enough to where I figured they could do one last volume with the new setup.
Oh well, I hope the "Final" chapter is extra long and good. Although to be honest, every "final" chapter generally has 1-3 more chapters after it as an epilogue. And then maybe one more after that a year or more later as one final hurrah.
It's why I never turn off updates for manga until it's been 5+ years after the manga "ended".