[Nefekto]

I have found 4 druid stones: Wolf, Snapper, Lion & Ripperbeast.

Where is the 5th?

[Lobedan]

The 5th druid stone is the druid stone of the shadowbeast. You get it from Runak north west of Silden.
Here a map: click

[Nefekto]

I talked to Runak, killed the Druid Hunters (Orcs) but don't know what to do next...

[eXecutioner]

I fought him and he had the shadowbeast stone on him. Then I loaded the game out of fear that it may impede the quest to get the shadowbeast stone.

So, 1 + 1: if you want the shadowbeast stone beat him and then do the quest.

[Nefekto]

Isn't there a peacefull way to get the stone?))

[Colmar]

Isn't there a peacefull way to get the stone?))

if you don't want to fight Runka, for him you must kill not only "druid hunting party" near the druid but also Gunock (http://www.worldofgothic.com/?go=g3displayquest&ID=528)

then as reward Runak gives you the stone of the shadowbeast

[Nefekto]

I liberated Geldern, Gunock is dead, but i can't select the option to ask Runak about the stone ^_^