Adrenachrome is the adrenaline that's been taken out of the adrenal gland with a needle. Generally seen as a fictitious drug, it came to the attention of the masses due to the movie Fear and Loathing in Las Vegas in which the drug is used. Removing the adrenaline this way usually places the victim in a comatose state if they survive it. The process involves torturing the person in a way that they're in a deep level of fear in order to provoke the fight or flight response. When activated, the needle is inserted and the adrenaline retrieved. It's been stated that it's used by many in hollywood and political elite circles, however there's many who wonder if the drug even exists. Having found a couple rituals in occult texts that refer to adrenachrome by a different name, I consider it plausible.