Hexashot Enhancement

At 6 stacks of the Harpoon Arrows, the Archer's auto-attacks deal additional Value unavailable magic damage = [50 + ([25% / 30% / 40%])Spell Power].
Each Auto-attack extends the Venomous Infusion poison duration by 1 second. While this talent is active, each empowered auto-attack consumes 5 Mana.