Alchemist- Array Master- Blacksmith
Apprentice: Useful in mortals
Junior: Useful in Qi Condensation Stage
Senior: Useful in Building Foundation Stage
Master: Useful in Golden Core Stage
Grandmaster: Useful in Nascent Soul Stage
Saint: Useful in Divine Soul Stage
Legendary: Useful in Ascension Stage
Immortal: Useful in Immortal Soul Stage with one stars and Heavenly Immortal Stage with two stars
King: Useful in True Immortal Stage with one stars and Immortal King Stage with two stars
Emperor: Useful in Quasi Immortal Emperor Stage with one stars and Immortal Emperor Stage with two stars
If someone has a better idea or name for the ranges, they can leave it in the comments and I'll be modifying as I watch :D