Even if you have learn from multiple discipline, you still retain a bit of everything and continue to progress and each of your felds of study.
Prerequisites: Character level 2 or more, At least 1 level in two different classes
Benefit: You need to choose a class when gaining this feat. Each level you gain in another class continue to progress this one at a rate of 1 level instead of 1/2 level. (see Multiclass rules)
Essentia (LOCKED): You gain +1 Virtual Level / Essentia in the class you choose when gaining this feat. Your virtual level give you everything you would normally gain by having that level, your effective level in that class cannot be higher than your total character level -1.
Normal: Usally you gain 1/2 your level from other classes to your Caster / Manifester / Initiator
Special: You can take this feat multiple times, but it apply to a different class.