TMI204 Heat signature 01

Demonic heat signatures detected through the rune.

TMI Rune, Heat Vision

The Heat Vision rune gives the wearer the ability to see demon heat signatures through their infrared radiation.

When the rune is first used, the Shadowhunter may experience sensory overload. Once they learn to focus and grow accustomed to it, they will be able to effectively filter out everything unimportant and hone in on the heat signatures.[1]

Known placements

Listed below are the known, regular placement of the rune on the bodies of some Shadowhunters, though this may change when a rune has faded from someone's skin enough to be almost invisible and is redrawn on another spot, or if they decide to draw more than one:


  • It is sort of a combination of the Heat and Vision runes,[2] both in appearance and function.