The modern-age Key, in both his incarnations, is a master of chemistry, and utilizes chemicals (most often in the form of drugs) as weapons. The modern-age Key used drugs to bend the Justice League to his will twice, and Batman once. More recently, the Key created a programmable psycho-virus that initiates a dream-like state that allows the Key to produce structured hallucinations. He created a machine that allowed him to steal energy from the mind of the infected person, and conceivably could make him the most powerful telepath in the universe (even able to open dimensional doorways at will).