Rank 1: Your Felhunter regains 4% of its maximum mana each time it hits with its Shadow Bite ability and the cooldown on that ability is reduced by 2 sec. In addition, increases the effect of your Felhunter's Fel Intelligence by 5%.

Rank 2: Your Felhunter regains 8% of its maximum mana each time it hits with its Shadow Bite ability and the cooldown on that ability is reduced by 4 sec. In addition, increases the effect of your Felhunter's Fel Intelligence by 10%.