Exp Reward: 1880 per helm
This favor will start immediately after defeating your second valkyrie and retrieving her helm. To find the Council, dock at the Mason’s Channel beach (before passing through the oarsmen statues). Climb the ledge then shimmy across a narrow passage.
Sindri has set up shop here so just approach him to register his location in your map then climb up the next wall. If you pass through the tunnel to the right, it will take you to a cliff beside an oarsman statue where you can find a hacksilver pouch and the treasure mound for the Njord’s Oarsmen treasure map. Otherwise, continue climbing up.
In the next ledge, loot the wooden chest then climb up to the large door where it leads you to the secluded area of the valkyries. You can’t do anything to continue with the favor if you visit this location early on. However, you can at least register the mystic gateway so you can conveniently return here easily once you have all 8 helmets.
Jump across the gap and look down behind to find an explosive jar. Throw your axe at it to clear the mineral deposit blocking the coffin. Drop down the ledge and go around it to reach the coffin. Loot the Solid Svartalfheim Steel and World Serpent Scales from it.
Continue along the main path and loot the wooden chest ahead. Drop down to the main council area and approach the mystic gateway to register it in your map. If you already have helmets in your possession, place them in their corresponding thrones. After placing all 8 helms, the favor will be complete. A realm tear will appear in the middle of the council area. Take note however, that activating the realm tear will unleash the toughest valkyrie yet and part of the last valkyrie favor.