Enjin: Kyokumei no Kokken

Enjin: Kyokumei Kokken (炎刃：旭明の黒剣, lit. "Flame Blade: Black Sword of the Rising Dawn") or just Enjin, is a technique used by Ieyasu Tokugawa using Onimaru.

Description
By absorbing and concentrating all of Onimaru's potent hellflames onto the edge of the blade, severely deforming it, but allows Onimaru to eradicated whatever it touches to nothingness for a short time frame.

It's an extremely strong ability, even being able to destroy Kurozou Sanzou's Dharmachakra and Gogyou Stoicheion's Deus Ex Machina.

Weakness
Despite the immense power of Enjin, a skillful opponent can easily dodge the deformed blade, attacking the user. The ability also makes Onimaru unusable for a while after use and drains the user's power.

Trivia

 * The technique is both based and named after Genryuusai Shigekuni Yamamoto's Zanka no Tachi, Higashi: Kyokujitsujin from the Bleach series.