Abyssal Anguish

Description
"Adds a shockwave of dark magick to the weapon and extends the duration of Dark Anguish."

Use
After a relatively brief incantation, enchants the current weapon with a dark-element enchantment (but it doesn't cause dark-element damage). While the enchantment is active, attacks create an extra tongue of dark energy, increasing the knight's effective attack range and adding extra hits and damage.

This is one of the most useful and powerful Mystick Knight melee skill. Try using with the staff heavy attack its almost like a staff sword.