The Dark Wave skill and Dark Swords

Only a Dark Knight can wield the terrible power of the demon sword

Dark Swords

Unlike regular broadswords, dark swords have a dark power embodied within. Usually those who have an innate ability to control Mana energy are good candidates. However if a person cannot control the dark power in the sword and tries to use one, he may become controlled by this power as it flows through his body, and may even succumb to it. If this happens he will then become accustomed to killing and destruction without thought, then finally become a berserker who cannot tell friend from foe.

The Dark Wave Skill

To use the dark power of these swords, the dark knight summons his strength and calls on the dark Mana power of the sword, which then absorbs some of the knight's vital force and it is released as waves of pure dark Mana energy from the blade. The dark wave spreads over a wide area and those in its path are injured by it. The stronger the soul the stronger the wave of darkness will be...and the more dangerous - and painful - it is for the dark knight.