Ghost stories, demonic possessions, and haunted architecture.
While the exact list varies by the curator, a "Mixed" pack of this size usually categorizes films into sub-genres to prevent viewer fatigue: 101 horror movies mega pack vol 2 mixed x264 ic fix
This stands for "Integrity Check" or "Index Correction," indicating that a previous version of the pack had broken files that are now repaired. Ghost stories, demonic possessions, and haunted architecture