Player fights enemies that no one sees and NPC never react like Shutter Island
My Idea – Guy is in mental asylum where he is being interviewed by a psychologist. He tells his story of how he is not crazy and the world is doomed. He tells a tale where he is ripped from this realm and tossed into a realm of darkness and light. Small light orbs guide him through their world. [some type of story]. The tale shows how the two realms of earth and darkness are converging and the [War?] will be brought to them. The player sees how the two worlds interact and he can jump from one realm to the other. In the end, he is right but not fully. He can move from one to another but it is because he is not human, and the realms are planets. He is a son of the universe which grants him power but his human shell can not hold such knowledge so he is turned mad and crazy.