Crisis

As your body tends to the toll of pain and agony you gain strength.

75% health - you gain 1d6 to your attack roll

50% health - you gain 2d6  to your attack roll and +2 to hit

25% health - you gain 4d6 to your attack roll, +3 initiative, and +5 to hit 

1-5 hp - you always move first, you can attack twice during your turn, you can make a reaction when you get attacked as close to 5 feet away before damage calculation, you gain 4d6 to your attack roll, +10 to hit