Earth
To use a skill, one needs to go through two steps - "alpha" and "beta". (Has been properly explained early in the story)
Note: [Custom] is the only exception to the rule.
Skill Types:
Rank 0 - [Front-Attack], [Mid-Attack], [Ranged-Attack], [Long Ranged-Attack], [Front-Defense], [Mid-Defense], [Ranged-Defense], [Evasive], [Low-Regenerative], [High-Regenerative], [Magic], [Spiritual], [Search], [Strategic], [Shape-Shifting], [Custom]
Rank 1 - ???
Rank 2 - ???
Rank 3 - ???
Rank 4 - ???
Rank 5 - ???
Rank 6 - ???
Rank 7 - ???
Rank 8 - ???
Rank 9 - ???
???
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Ranked Skills are further subdivided into - [White], [Blue], [Red], [Yellow], [Purple] and [Black] with [White] ranked skills being the lowest quality and [Black] ranked skills being the highest quality.
Rank 0 Mages can only use Rank 0 Skills.
Rank 1 Mages can use both Rank 0 and Rank 1 Skills.
Rank 2 Mages can use Rank 0, Rank 1, and Rank 2 Skills.
And so on.
VRMMORPG - CHAOS
(Currently not much is known about it. Details will be added in the future.)
Third World
Two types of skills - [Ranked] and [Unique].
There are three types of ranked skills - [Combative], [Healing], and [Sealing].
Ranks of [Ranked] skills - [Bronze], [Silver], [Gold], [Diamond] and [Enum].
Further subdivisions - Low, Mid, High.