Rank 1: Increases your critical strike chance with spells by an additional 1% and gives you a 8% chance when hit by a physical attack to reduce the cast time of your next Shadow Bolt or Incinerate spell by 100%. This effect lasts 8 sec and will not occur more than once every 8 seconds.

Rank 2: Increases your critical strike chance with spells by an additional 2% and gives you a 16% chance when hit by a physical attack to reduce the cast time of your next Shadow Bolt or Incinerate spell by 100%. This effect lasts 8 sec and will not occur more than once every 8 seconds.

Rank 3: Increases your critical strike chance with spells by an additional 3% and gives you a 25% chance when hit by a physical attack to reduce the cast time of your next Shadow Bolt or Incinerate spell by 100%. This effect lasts 8 sec and will not occur more than once every 8 seconds.