The Codex could mark which spirits are most common in specific areas like the Sewer or the Library.
Since the protagonist, Haru, is a schoolgirl, this feature could be stylised as her personal or scrapbook , filled with hand-drawn illustrations and frantic notes about the horrors she survives. 1. Spirit Profiles & Behavioral Logs yomawari-midnight-shadows-codex
A visual representation of how close you can get before your heartbeat spikes, affecting your stamina. 2. Urban Legends & Lore The Codex could mark which spirits are most
It could suggest which Omamori (Charms) are most effective against certain spirit types, such as using the Small Flower to slow down light-sensitive enemies. 4. Meta-Commentary (The "Malice" Twist) is a schoolgirl
Brief notes on how the spirit reacts to light or sound.