Kokuryū Raigō

Kokuryū Raigō (黒龍雷迎, lit. The Advent of the Black Dragon's Lightning): This is an original spell created by Negi, achieved via Magia Erebea's Berserk Mode used by Negi absorbing the Thousand Thunderbolts spell using Dextra Stagnant than releasing it using Dextra Emittam after making physical contact with the target, releasing black lightning that has enough power to damage the opponent and the surrounding area.