Krailos Quest/Spoiler

Method
This quest consists of several missions assigned to you by several NPCs around Krailos.

Survival of the Strongest
Find Grubokk in the mountain range to the south. Talk to him about a quest and he will say you can help him punish the Goblin slaves if you swear never to help any goblin ever. Do so.

Grubokk will tell you to start off by sabotaging 10 Crude Water Conveyors so that the goblins will have to suffer from thirst. Go down the hole to the left of him and follow the way to the Krailos Mines. Along the way and in the mines themselves you will come across several Dead Goblins (Fresh Quest) and Dead Goblins (Decaying Quest). Use their corpses until you manage to find a Heavy Stone Hammer. Go to the nearest Crude Water Conveyor and use the hammer on it ten times to complete the task.