SSS: Omnipotent Skills (Examples: Omni-Manipulation, True Omnipotence, etc.)
SS: Near-Omnipotent Skills (Basically invincible except against Omnipotent beings.)
S: Near-Multiverse Level (Capable of affecting or destroying multiple universes, but not quite Omnipotent.)
A: Single Universe Level Skills (Example: The power of the 6 Infinity Stones in the MCU / Earth-199999 used for 'The Snap'.)
B: Dimensional Lord Level Skills (Example: Dormammu, Mephisto, etc.)
C: Divine Level Skills (for Mortals) (Example: Chaos Magic, Odin Force, etc.)
D: Superhero Level Skills (Example: Super Strength, Super Speed, Spider-Man level, etc.)
E: Mortal Level (Example: Driving proficiency, Cooking, basic combat skills, etc.)