Build up momentum for 20 seconds. While active, hit with 4 light or heavy attacks to turn this into Assassin's Will and fire a spectral bow to deal Magic Damage. Also grants Minor Berserk, increasing your damage by 8%.
- Unlocked at Assassination rank 42.
- U6: This ability allows you to fire a spectral projectile at your target, dealing magic damage.
- U2: Incapacitate: This ability now increases heavy attack damage. 
- U3: Incapacitate: This ability now has a visual effect when an enemy is immobilized. 
- U6: This ability has replaced Haste in the Assassination tree. Any experience gained in Haste will now apply to Grim Focus. 
- U6: When Grim Focus is activated, all weapon attacks will do additional damage for 20 seconds. Using light attacks or heavy attacks while the effect is active will grant a charge. When you gain eight charges, Grim Focus changes to Assassin's Will.