Shadow Orbs - Our new mastery Shadow Orb Power, results in increased damage from the stacking buff, Shadow Orbs, that we receive for specializing in the Shadow tree. Proccing from the ticks of our Shadow Word: Pain and Mind Flay spells, we gain a stacking buff of up to 3 Shadow Orbs. These stacks are consumed with casting Mind Blast or Mind Spike. Depending on which spell is cast, we receive a 10% damage bonus to that spell for each stack of Shadow Orbs consumed. We receive an additional 1.3% damage to this per point of mastery. Also, we receive the 15 second buff Empowered Shadows, increasing the damage of our periodic damage spells by 10% when our Shadow Orbs are consumed. The percentage of this damage increases 1.3% per point of mastery as well.
The two effects of consuming our Shadow Orbs, buffing Mind Spike/Mind Blast damage and DOT damage, warrant a bit more explanation in their execution. Empowered Shadows is gained by consuming at least one Shadow Orb. The number Shadow Orb stacks consumed has no effect on the % damage increase on our periodic spells and will remain the same whether 1, 2, or 3 Shadow Orbs are consumed. The effect of the stacks is only important in the increase of amplified damage of Mind Blast and Mind Spike. Only these two spells receive higher damage with more Shadow Orb stacks consumed.