Ryuenjin

"Up + S.M. button on the ground. A powerful attack that burns enemies with flames. Some objects may be burned with this technique."

- In-game text

Ryuuenjin, or Ryūenjin (龍炎刃), also known as "Dragon Flame Blade", is the special technique that Zero learns after defeating Magma Dragoon in Mega Man X4. 

Similar Techniques

 * Rising from Mega Man Xtreme 2
 * E-Blade from Mega Man X5

Counterpart to this Technique

 * Rising Fire