While different kingdoms have different power levels the general power level can be drawn as follows.[More will be added as new kingdoms will be explored.]

A=Aura | M=Magic | D=Demon Energy

Demon energy is used for Transformation and as a replacement for Magic

and 1D = 1A+1M

Power level is the pointer of the potential of one person and without proficiency, it is useless as a person with 700M with no proficiency in magic can be defeated by an average Human with 50% proficiency. Applies to all races.

All races increase their power levels by a factor of 10-50% every year as they grow until the age of 18 depending upon the experience and hard work they put into it.

Humans:

Average Human:10(A),10(M)

Apprentice Human:50(A), 50(M)

Master Mage:200(A), 200(M)

High Mage:500(A), 500(M)

Supreme Mage:1000(A), 1000(M)

Duke/Royal Mage:2500(A), 2500(M)

King:5000(A), 5000(M)

Demons:

1D=1M+1A

The drawback of Demon energy is that it is limited to Demon continent and a Demon can't stay away from that place for a long period or his power will start deteriorating

Average Demon:20(D)

Lesser Demon:100(D)

Mid Demon: 400(D)

High Demon: 1000(D)

Supreme Demon: 2000(D)

Royal Demon:5000(D)

Demon King:10000(D)

Demons also have special Transformation powers which can be used in emergencies but they become extremely weak after using that power, duration of weakness depends on the level of the Demon itself.

Devils:

Races that were once normal (Elves, Orcs, Humans, Fairies, etc) but consumed excess Demon energy by force or by their own will and turned.

They lose their ability to use Magic but keep their Aura within them.

They will lose Demon energy as they move away from the continent but not their Aura.

They need to perform sacrifices to keep the Demon energy within them or else it will start leaking out after a fixed amount of time which will result in degeneration of the environment around them and reduction of their power.

They can also get more powerful by absorbing the life force of living creatures (including other Devils too) depending upon the amount of Magic and Aura they have.

Supreme Devils and above can use transformations

Their power levels differ based on the species they turned from.

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Taking Human as a base.

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Average Devil: 20(D) + Species Aura level

Lesser Devil: 50(D) + Species Aura level

Mid Devil: 200(D) + Species Aura level

High Devil: 500(D) + Species Aura level

Supreme Devil: 1000(D) + Species Aura level + Transformation

Sin Devils:3500(D) + Species Aura level + Transformation

Devil King:9000(D) AD + Species Aura level + Transformation

Elves:

Races that are gifted with Mana, they don't possess Aura but have high agility and perception.

Their senses are also sharper than many other races. They have long ears and are generally beautiful. They have a lifespan of 100-200years but some may live over 1000years.

The highest is their King with his Branches of Yggdrasil. Currently, 5 Branches are active with 2 inactive Branches.

Average Elf: 40(M) [AE= Average Elf]

Lower Elf: 200(M)

Middle Elf: 800(M)

Upper Elf: 2000(M)

Supreme Elf: 4000(M)

Branches of Yggdrasil: 10000(M)

Elf King:20000(M)

Elves can also communicate with nature to ask for an external source of mana, if granted under a particular set of conditions, their mana becomes immeasurable[Only Supreme Elves and above can fulfil all the conditions of communicating with nature]