Viking: Battle for Asgard/Galcliff

You'll begin this island on the coast, as your fellow warriors have sailed from Niflberg to help retake the island from Hel's forces.

Distillery
Enter from the SW side, avoid the patrols. Clear the few guards near the captives then free them.

Longship Graveyard
From Holdenfort, head out the north gates by Shaman Asta. Head forward into the cave to kill the legion forces and get some easy gold, then climb up the terraced mountain steps and make your way into the graveyard. As you get to the top you'll see viking warriors peaking around corners, watching you. There will be no enemies here - when you get to the top you'll reach a trap door. A cutscene will take place in which the leader of the guerrilla warriors will tell Skarin that they will not join his forces until he retrieves the dragon gem Hugin from Caldberg.

A new objective will appear on your map on the west side of Caldberg, and like with Darkwater and Holdenfort, you'll have to sneak (or slaughter) your way to retrieve it.