Skills & Spell upgrades

[Serpentis]

Been wondering how they have this set up...

When you first start off, you automatically get your apprentice I stuff... you then have to purchase your apprentice II, but where do the apprentice III stuff come from?

Apprentice I - got these as I leveled
Apprentice II - bought these
Apprentice III - no clue
Adept I - Looted most of these off of mobs
Adept II - no idea (prolly have to buy them someplace)
Adept III - I give up

haven't seen what comes after Adept yet... Dolby or Kudane...can ya fill in some blanks here...

[Ilion Sturmlied]

Apprentice III is made by Artisans with common resources
Adept III is the same but with rare resources
Master III Ultra rare resources

Adept II and Master II are Quests Spells