Epimetheus

Epimetheus the power of Epimetheus is to "capture and learn the mechanics behind " an attack that is used against him. When an attack is used against him, Umako will create a prism. Upon contact with the attack, the prism erupts into a mass of water and consumes that attack. Moments later the crystal reforms back behind Umako. After reforming the crystal begins to glow and will then attempt to reverse engineer the attack, while doing so Umako is unable to use this jutsu again until it is done. Upon learning the mechanics behind the attack, the crystal will shatter into chakra which will instantly be absorbed by Umako. Due to just learning the attack Umako is unable to use it right away and must learn it himself. This give him the chances to develop different sub attacks, as well as different based on the mechanics of one.

Trivia

 * Epimetheus (Greek: Ἐπιμηθεύς, which might mean "hindsight", literally "afterthinker" was the brother of Prometheus (traditionally interpreted as "foresight", literally "fore-thinker"), a pair of Titans who "acted as representatives of mankind". They were the sons of Iapetus, who in other contexts was the father of Atlas.
 * Koma stated that Umako either learned this jutsu or created it due him not possessing the Sharingan, while other state it was due to his thirst for knowledge.
 * During his time, Umako stated that a user who has a water nature can gain access to this jutsu, and the user must give up their water nature in order to use it. Koma is able to use this despite not having a water nature due it him using Umako's body.
 * While Stating that the Prism Release is needed to use this jutsu, Umako stated that it is not necessary.
 * The rank of the jutsu doesn't matter upon capturing, but the nature type does. He is only able to capture jutsu that is the same nature types he knows. It is the same of dōjutsu. Though unlike the Prometheus, if a kekkei genkai has an element that he has, he is able to capture it.