You are using a specific legacy mod that hasn't been updated for the Anniversary Edition's engine.
Even those mods often cause crashes on Windows 11. titan quest anniversary edition enhanced vs legacy top
You see two checkboxes in your Steam library: and Titan Quest Anniversary Edition - Legacy . You are using a specific legacy mod that
Buy the Anniversary Edition . The “Legacy” version is only for retro enthusiasts or those running antique hardware (e.g., Windows XP with a GeForce 6800). Buy the Anniversary Edition
Bundles the base game and Immortal Throne expansion into one seamless experience.
However, the gameplay and story are still as engaging as ever. The combat system, which combines elements of hack-and-slash and character customization, remains addictive and challenging. The game's world, inspired by Greek mythology, is richly detailed and immersive, with a compelling narrative that explores themes of fate and destiny.