[Radek]

It§s somewhere in the "best tips". IIRC then:

The Temple:
Artifacts - level 3, all roles
Cabalist - level 4, all roles
Crusade - level 5, only paladins
Healer - level 5, all roles
Quickspeak, level 5, all roles
Oath of Scrolls, level 6, all roles

The Mages Guild:
Artifacts - level 3, all roles
Occultist - level 4, all roles
Quickspeak - level 5, all roles
Oath of Scrolls - level 6, all roles

The Warrior Guild:
Blacksmith - level 3, all roles
Doublestrike - level 4, all roles
Ironmight - level 5, all roles
Stunning Blow - level 5, only barbarians
Fletchery - level 5, only rangers
Oath of Swords - level 6, all roles

Bushi Dojo
Tiger Strike - level 4 (or 5?), only zenmasters??
Spirit Shield - level 4 (or 5?), only zenmasters?? (does not work in unpatched game)
Chi Master - level 5, only zenmasters, must(?) be level 15
Enlightement - level 6, only zenmasters, must be level 18

The Thief Guild:
Merchant - level 3, all roles
Deadfall - level 4, only thieves??
Iron Lung - level 5, only some thieves??
Backstab - level 6, all roles??