Before you gather your companions make sure you are stocked up on ammo and potions, and make any armour or weapon changes that you may have in you chest for the fight that lies ahead. Once you gather your companions a cut scene will play where each one of them has something to say about what you have to do. When the cut scene ends you’ll be transported to the entrance of sanctuary.
Now you’ll have to fight your way up to the top. There’s no point in collecting loot, you should already have everything you need, it’ll only weigh you down if you do. Along the way you’ll lose your companions one by one and you’ll be alone by the time you reach the top.
Thanks for watching and happy gaming