TMI204 HeatVision rune 01

The rune applied on Clary's skin for the first time.

TMI204 Heat signature 01

Demonic heat signatures detected through the rune.

TMI204 HeatVision rune 02

The rune on Jocelyn's hand.

The Heat Vision rune gives the wearer the ability to see demon heat signatures through their infrared radiation.[1]

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.


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