There Is One Alternate Ending That I Saw From ManlyBadassHero Video That The Ending Added A Little Line. There Is A Possibility That You Can Change The Ending In What You Decision But For ManlyBadassHero The Ending Added A New Line When Kat Say Her Last Word Said "I Don't What To Die" And The Added Line Was The Unknown Person On Front Of Her Said "Why Not?. Everyone Try It At Least Once. I Don't Know How He Did It The Video Has A Cut Scene That Forward The Video Is Hard To Watch How He Did It. But You Can Watch If You Like Friend If You Are Disappointed I Understand What Have You Experience Played The Game
Also The Rune Is Not Useless The Rune Protect You When Doing The Ritual Or Something Like That.
"Stay Safe "