Hallex

Hallex is the name of a controlled substance in the ficitional Mass Effect universe. It induces heightened senses and extreme euphoria in those who dose themselves with it not unlike ectasy, a very famous club drug. Not much has been mentioned about this substance, other than it is used by the asari Ardat-Yakshi, Morinth, who both soncumed it herself and on her victims. Complementing it with her gorgeous looks and great sex appeal, the Hallex would facilitate her 'hunt' making her victims less aware of what was going on and raising their desire to mate with her. The Omega citizen, Nef, fell victim to this tactic. It is unkown in which method the Hallex is taken or consumed, a vial of Hallex was shown in a table in Morinth's apartment during Samara's loyalty mission, it appears as a glowing purple/pink liquid, investigating it causes Morinth to affer you a 'shot' of Hallex, hinting that it is most probably drunk.