Normally some of the stronger trolls (boss) have a runestone to open a way to Mundus! You need 2 stones to open a barriere!
Have you took all te loot the trolls left after you die them?
On 7th of february 2015 : I start a new adventure in the Divinity world of Original Sin,
it's a Fantastic Freaking Fabulous Funny ... it's my All Time Favorite One !
| 
