Rank 1 Gives you a 8% chance after Blocking and a 20% chance after receiving a non-periodic critical strike to gain an extra attack. Stores up to 4 extra attacks. Cannot occur from Blocks more than once every 1.5 sec.
Rank 2 Gives you a 16% chance after Blocking and a 40% chance after receiving a non-periodic critical strike to gain an extra attack. Stores up to 4 extra attacks. Cannot occur from Blocks more than once every 1.5 sec.
Rank 3 Gives you a 24% chance after Blocking and a 60% chance after receiving a non-periodic critical strike to gain an extra attack. Stores up to 4 extra attacks. Cannot occur from Blocks more than once every 1.5 sec.
Rank 4 Gives you a 32% chance after Blocking and a 80% chance after receiving a non-periodic critical strike to gain an extra attack. Stores up to 4 extra attacks. Cannot occur from Blocks more than once every 1.5 sec.
Rank 5 Gives you a 40% chance after Blocking and a 100% chance after receiving a non-periodic critical strike to gain an extra attack. Stores up to 4 extra attacks. Cannot occur from Blocks more than once every 1.5 sec.