After getting the Dragon Armor I killed the Stout King and all the Stouts into the mines.. That gave much experience... but when Freyedies died, the Storyteller said, "blabla.. as if something evil is amused about the death of the noble king.." So I wonder if there are any consequences for killing the king??! Or doesn´t it matter??

UNFORTUNATELY -

There are NO consequences to killing the king or any of the other NPCS in the game.

It is obvious that the designers original intentions were that there should be consequences if you violate your oath but the finished game doesn't care.

So, you're okay.

Wyv

We are all still waiting for the ultimate patch: The ultimate one, who will put those elements into the gameplay.