Kall Fimbulbringer
How to summon

Tips
- The final boss: summon him with three Malicious Blood at the Strange Bowl deep in his prison, reached through the Aesir Passage.
- Three phases with their own health (10,000, 7,000 and 30,000). He can't be staggered and resists Pierce, fire, Frost and Lightning, so bring Slash or Blunt.
- His chain whirl and rush punish standing still; in the last phase, below 35% health, spikes of ice rain down.
- His Sacrificial Blood goes on the Chiselled Platform of the Sacrificial Stones to end the game.
Hugin says
Calling forth the beast
You have found the summoning place of one of the Forsaken. Make the correct offering at their altar and they will come. Be wary though, the Forsaken are not easy prey, so craft a wicked weapon, don your finest armour, and eat a hearty meal before engaging them in combat.
Congratulations, warrior!
Return to the Sacrificial Stones with your Forsaken trophy and offer it as a sacrifice to make the Gods smile upon you.
One last trial...
Be wary! The being imprisoned beyond this gate is mighty, more so than any other to be found in all of Valheim. You would do well to prepare accordingly before you venture forth to this final foe.
It is time...
Well done, warrior! You have found the sacrificial blood, the final key to restoring this realm. Now the All-Father has one last task for you – prove yourself worthy by journeying back to where it all began!
Journey to Valhalla
Well done, warrior! At long last, you have slain all Forsaken and proven yourself worthy. The gates of Valhalla are now open to you – all you need to do is to let the valkyrie carry you there. But worry not, you will always be welcome here in the tenth world, should you wish to return.