Body refining , cant remember this one/but i think something with blood arteries or similar/ , Yuanfu palace or just yuanfu , heavenly dipper , astronomical phenomenon , immortal stage , immortal king , immortal emperor.
Oh, that's kinda disappointing Body Refining is w/e because mortals the Yuanfu I don't know what it means, but then it goes for the constellation/star theme and just says fuck it, let's just use generic Immortal titles now.
Well everyone uses astral souls after the second level , so its not surprising that its generalized later on. Spoiler The world they live in is a side world to the Immortal territory anyway.
And when does the protagonist get to those stages? because i read until the chapter one hundred and forty-something and he had yet to step into the Yuanfu stage...