I have a pretty cool idea but imma keep it quick.
The perfect sacrifice to their god (no name yet) is the mc (no name yet)
There is a solar eclipse that is caused by the god, once that solar eclipse goes away all of his worshipers will slowly melt (in great and close detail) so they have to find and capture mc.
They have to sacrifice him by (i will not metion some. Of these things) skin him alive, cut out his heart, put the heart through the smelter, then slice the bottoms of his feet, and then hang him up until the sun comes back out and melts him for the god to absorb.