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Traveller (lol really?): Combination of Trickster and Vagrant. More stamina, stronger light armour and archery. Fire arrows will break and be lost upon impact, but explode multiple times.

To be assigned any of these hidden classes, you must

have more than ten points in both classes
not have more points in a third class
You can change to other hidden classes if a third subclass overtakes one of your two main classes - or worse: You can lose your hidden class status altogether if the new combination doesn't have any assigned effect.

The following combinations may appear intuitive but have no hidden class (on the German wiki):

Bladedancer + Mage (no spellswords of any type)
Elementalist + Infiltrator or Vagrant (no mix between elemental magic and stealth or alchemy)
Infiltrator + Trickster (sorry to all of those who ever played Skyrim, no bow + sneak)
Vagrant + Armour (workaround: Seraph allows both Keeper and Vagrant, combined with thaumaturge - allowing a heavy armour and greatweapon build that uses a hidden effect)
Infiltrator + Vagrant (no poison bonuses whatsoever. Alchemy is a sidearm, not a weapon)

밑줄친 부분이 잠입자Infiltrator(은신,화술,소매치기) + 재주꾼Trickster(활,자물쇠) 클래스 인데 히든 클래스는 없다고 하네요

불화살 자주쓰시면 표에서 맨밑 클래스(숙련된 여행자) 여시는게 좋은데 도적트리중 가운데 계열인 방랑자(Vagrant) 올리셔야 할듯 ㅎㅎ;;