Skill Rank / Class Rank:
Novice -> Apprentice -> Adept -> Expert -> Master -> Archon -> Exarch -> Demi-God -> Acension
Weapons/Artifacts Rank:
Common -> Rare -> Epic -> Legendary -> Divine
NOTE: Keep in mind, Rank is a reference. In Lore, some skills/weapons/classes were inherently stronger than others. Like the difference between an ugly diamond and a beautiful stone.
For example:
Novice Witch > Adept Knight
Echo Magic: Adept Rank > Fire Magic: Master Rank