Fenrir is the third Boss. The battle takes place in a dark cave. You will have to use your focus a lot. This makes the Boss vulnerable. Without your focus active, you will not deal him damage. The focus also slows down time, which makes it easier to dodge attacks and landmore combos. Fenrir is a big wolf enemy and only uses close range attacks. He is big and slow, but powerful. Dodge all his attacks, blocking usually gets you knocked to the ground. For his AOE jump attacks, dodge away. For his other attacks, dodge sideways. It is best if you stick to heavy attacks. Land 1-2 hits, dodge, repeat. When the screen goes dark, you need to activate your focus. When you have to search for Fenrir (he hides in the dark multiple times throughout the fight), you should get ready to dodge. He always does a charge or jump attack when he comes out of the dark.
Defeating Hela
For the final battle, Senua unlocks a powerful sword that can kill minions in a single attack — when powered up, use focus and then use [L1 + Square] to initiate a sprinting stab combo that kills regular enemies in one hit. As you move toward the final encounter, you'll reach an arena where swarms of regular enemies will spawn. Chain your running combo to quickly kill weaker enemies, and keep the chain going to kill the stronger ones as they appear. Using focus (when its fully charged) will help a lot. When you kill enough enemies, a shadow will appear on the second arena platform. The shadow will transform into the various bosses you've encountered throughout the game — you'll recognize the silhouette, making it more obvious what attacks you can expect. Use focus and keep hammering it. On the final platform, when you reach the arena with Hela crouched in the center, you'll have to succumb to the enemies — let them kill Senua, and you'll complete the game.
Defeating Surtr, God Of Fire
Surtr is the second Boss. At the start of the game, take the right path to fight this Boss (if you go left, you will encounter Valravn, God Of Illusion; you will eventually have to fight them both). Surtr is the easiest Boss in the game. He is very slow and does not spawn any minions. Dodge sideways and he will almost always miss you. Then, perform one or two heavy attacks and repeat. Over the course of the fight, Surtr will kneel down and be surrounded by fire. The fire does not hurt you -- so rush towards him and land some heavy attacks from behind while he kneels. This will deplete his health very quickly. If he knocks you on the ground, press X (PlayStation controller) quickly to get back up. When he starts burning, stop attacking and use your vision. This will make him vulnerable and he will stop burning.
Extended Ending
You need to have 100% completion. Another things that you must have is that before the final battle, you should have got all the 44 lorestones. The game has 11 sequences. You can keep track of your lorestone progress as you finish the game using the lorestones. You will see a circle of red runes, each set separated by a dot when approaching a lorestone. The dot signifies divisions of the chapter. When you collect a lorestone, you will notice that the circle of red runes have turned white. When a section between the dots has all white runes and no red runes, it means you have found all the runes in that sequence. Find all the lorestones and see the super cool extra scene before the final boss battle.
Moves When You Are In Motion
Senua can also run and attack, she can also dodge back, front and sideways. Now you can use multiple buttons to perform the moves.
Shift + W + Fast Strike - Thrust In Enemy with force.
Shift + W + Heavy Strike - Vertical Heavy Slash with a Jump.
Shift + W + Melee - Senua Jumps and strikes with knee.
Various Steam Achievements
Complete the indicated task to unlock the achievement.
Defeating Fenrir...