The game features a complex Magick system that allows players to create different spells by combining runes. These spells can attack enemies, dispel illusions, and heal characters' bodies and items.
Eternal Darkness: Sanity's Requiem also introduces a unique feature called Sanity, which drops when an enemy sees a character. Low Sanity levels cause hallucinations, making the game world distort. However, Sanity can be restored by defeating enemies, using spells or special items, or by ending their lives.