Portal Gem Quest

• Enter the Portal and inspect the central part of the portal to see that the gem is missing.
• Accept Candice's Quest to Find and Place the Portal Gem. 
• Go talk to the Dwarf

The Rune Stone Quest

• He will agree to help you if you find him a Pickax. 
• Accept the quest and then go to the Huntsman's House to search an HOG scene.
• Search through the scene and you will receive the Pickax
• Return to the Dwarf to give him the pickax. 
• He will reward you with the Gem. 
• Go to the portal.
• Use the gem on the portal.
• You'll have to play a mini-game to restore the portal. 

Restoring the Portal

• Simply move the fragments and place them in the right order to restore the image. 
• Enter the portal.