losing yourself
Horror where identity, memory or reality itself stops feeling stable, and the audience loses that stability along with the character. Perfect Blue, The Neon Demon, Midsommar.
systems bigger than you
Being trapped inside a belief system, cult, institution or ancient force that existed long before you arrived. Personal choices may not be enough to escape it. Midsommar, Martyrs, The Exorcist, Nosferatu.
isolation & unseen
Help is too far away, communication is failing, and the character is alone with the unknown — physically like Alien and Jaws, or psychologically like The Blair Witch Project.