Terrigen Mist is a fictional substance from the Marvel Comics universe. It is a transformative mist that can grant superhuman abilities to individuals with Inhuman heritage. When exposed to the mist, these individuals undergo a process called Terrigenesis, which unlocks their latent powers. The mist originates from the Terrigen Crystals, which are sacred to the Inhumans. The process of exposure can vary in effects, leading to a wide range of abilities, from enhanced strength to unique powers. However, not everyone survives the transformation, making it a significant and sometimes dangerous rite of passage for the Inhumans.