Kōkyūshū

is one of the original lightning techniques derived from Izaya’s Internal Chakra Redirection method, which is also a requirement to perform this technique, to take his own element to an entire new level, and made him capable to lead the absorbed chakra throughout his entire nervous- and chakra-system. May it be produced or natural lightning, Izaya literally “absorbs” the element with his bare hands, to “enhance” it with his own, before backfiring it at the opponent with a stronger force behind it. To lead natural lightning without dangers, one must have mastered the ICR-method and “understand” the element thoroughly; Izaya had tried to absorb lightning in his youth, which had gone deadly wrong, nearly killing him in the process. In other words, the absorbed lightning may not remain in the body for any longer than required, to reduce the chance of it being backfired.