Tenha Seiou Zan

Tenha Seikouzan (Heavenly Domination: Threatening Gleam Slice) is one of Haohmaru's Super Special Moves, and one of his signature attacks in the Samurai Shodown series, first appearing in Samurai Shodown II.

Description
Haohmaru does a strong downward diagonal slash, creating a trail of energy in its wake.

Strategy
One of the best Weapon-Flipping Techniques in the series due to its fast startup, range and damage. It can be used as an on-reaction punish against most moves from almost anywhere on the screen, and can be used to hit the start up of slow moves like some fireballs.

Interestingly, in KOF XV, the version starts 8 frames slower than the  version, so be careful when using it so it doesn't whiff.