Not much is known about this being, except for his odd minotaur-like appearance and his creation of Echo. He studied and experimented and perfected the steroid, not fully realizing it's damaging effects. The sludgy, gray liquid was eventually processed through seven different vents, which created the seven forms of Echo: Shortly after his mad invention, Rhyden was visited by Demongo. Demongo stole three of his echo bodies and retreated, which infuriated Rhyden. In his anger, he smote Dori's home village, thus causing it's destruction and motivating Dori. Rhyden madly ingested his precious echo in his search for power and it drove him wild, lost in the drug's addictive hold. The poison Echo ate away at his body until both present and future Rhydens died at the hand of Dori.