Alternate Ending
If you free the Sorcerer that Darkhunter wishes you to take to the Red Tower near the start of the game you will gain access to three areas you normally wouldn't near the end of the game along with a new ending.
The sequel to the award winning Hellblade: Senua’s Sacrifice, Senua returns in a brutal journey of survival through the myth and torment of Viking Iceland. Intent on saving those who have fallen victim to the horrors of tyranny, Senua faces a battle of overcoming the darkness within and without.