Powerful Slash is an imbuement that can be applied to items of type Swords, Helmets. When applied, it raises sword fighting skill by 4.
Astral Sources
When imbuing an item with Powerful Slash, the following items are expended:
25× Lion's Mane, 25× Mooh'tah Shell, 5× War Crystal
Notes
The ability to apply this imbuement can be obtained by defeating The Enraged Thorn Knight during the Forgotten Knowledge Quest.