Inferno Blade

(Tome of Battle: The Book of Nine Swords, page 54, DnD 3.5)

Desert Wind (Boost) [Fire]

Level: ; Swordsage 7
Prerequisite: Desert Wind maneuvers
Casting Time: 1 swift action
Range: Personal
Target: You
Duration: End of turn

A blinding light flashes from your weapon, and for a split second, it transforms into burning magma.

You convert your ki into fiery energy, allowing it to flow down your arms and across your weapon. Until the end of your turn, your melee attacks deal an extra 3d6 points of fire damage + 1 point per initiator level.
This maneuver is a supernatural ability.