Acid Permeation

Utakata blows acidic bubbles from his pipe that burn anything it comes into contact with. The sheer multitude and wide-range it can cover makes avoiding it very difficult.

Trivia

 * Santōka is the given name of . He was a haiku poet, well-known for his free style haiku lacking the traditional 5-7-5 syllabic rule and seasonal word. He is called a wandering poet for the many trips he took in his later life as a Buddhist monk, wandering through Japan without being part of a monastery.
 * The san in Santōka's name is actually written with the kanji for, but for this technique, it is interpreted as , also pronounced san. Tōka is interpreted as meaning instead of  and , which it means in Santōka's name.
 * Although he wasn't shown using this technique in the manga, it was stated he could mix acid in with his bubble ninjutsu.