Power
Adventurers: Those who joined a guild and are separated by rank.
Soil (Lowest)
Wood
Stone
Iron
Steel
Bronze
Silver
Gold
Black Gold
Platinum
True Platinum
Pearl
Opal
Amethyst
Emerald
Ruby
Sapphire
Diamond
Rainbow Diamond
Singularity Diamond (Highest)
Monsters: Those that are deemed dangerous and are ranked in letters including the named ranks. This only estimates a SINGLE monster's strength. Also, skills may or may not affect their rank.
J: A monster that a young child can defeat. Example: Colorless Slime.
I: A monster that an average villager can defeat. Ex. Cave Spider.
H: A monster that a newbie adventurer can defeat (Wood rank) Ex. Goblin
G: Able to destroy a village. Ex. Gray Wolf (Adult)
F (Notice class): Able to destroy a large village/ Stone rank. Ex. Silver Wolf
E (Guarded class): Able to destroy multiple villages. Ex. Giant Slime (Any kind)
D (Attention class): Able to destroy a small city or kingdom. Iron rank Ex. Hobgoblin
C (Caution class): Able to destroy an average city or kingdom Ex. Dire Wolf
B (Hazard class): Able to destroy a large city or kingdom Ex. A low-ranked Heavenkin/Hellkin
A (Warning class): Able to destroy multiple cities or kingdoms Ex. Drake
S (Danger class): Able to destroy an island Ex. Dragon (Child)
V (Storm class): Able to destroy multiple islands Ex. Death Swordmaster
U (Severe Storm class): Able to destroy a nation Ex. Dragon (Adult)
X (Extreme Storm class): Able to destroy multiple nations Ex. Oni Warlord
Z (Disaster class): Able to destroy a continent Ex. Dragon (Elder)
XZ (Catastrophe class): Able to destroy multiple continents
EXT (Apocalypse class): This monster must have the power to put multiple species or at least half of the planet to complete extinction or near extinction. Ex. Dragon (Ancient)
EXTZ (Extinction class): The strongest class of all. This monster must have the power to wipe all life on earth. Every kingdom, guild, and clan must band together to even have a chance of survival.
Weekly Power Status
-- Power
Ranking 
-- Power
stone