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This article contains plot details from the latest books.
Aromark is a form of ogre biotechnology that is transferred by touch. It can be used as a tracker or a homing device. All of the ogres' weapons use aromark as their targeting system. As long as they lock onto the enzyme, it's a guaranteed direct hit to where the aromark is. It is treated by piquatine, which is a liquid that melts off your skin to remove any traces.