Clive Barker's Undying (2001)

What a horrible night to have a curse! Someone should have warned the Covenant children: “Never read aloud strange rituals.” Little did they know that their childish game would unleash unspeakable horrors upon the unsuspecting world. Now, many years later, Jeremiah Covenant, the last sane sibling, lies on his deathbed knowing his fragile existence is the only thing restraining the curse. His only hope is Patrick Galloway, a fellow soldier from the Great War and a specialist in abolishing evil abominations. Welcome to Clive Barker’s Undying, a horrifying FPS romp of curses, strange, mad creatures, and family dysfunction gone terribly wrong. Step into the shoes of Patrick Galloway as you attempt to banish the evil using your arcane magic and the ever-dependable six shooter of metal grace. Pray to whatever god you believe in because this journey may end up costing your soul. First person shooter meets the contemporary master of horror fiction, don't miss it!