S1·E7 Golden Rain

Tenma and the others learn the immortal Specters can be destroyed using berries from the Goldenrain tree that grows in the Underworld. When they reach the tree, the Gemini Golden Saint Asmita appears. Asmita has been studying meditation in his own world, void of light, and so criticizes Tenma's fighting ability, releasing the "Tenmaihourin" - which takes away a person's five senses.