The thunderstriker adopts an unusual fighting style, gripping a heavy weapon with both hands and switching to a defensive posture with weapon and buckler, lashing out with the shield with surprising speed and power.
At 3rd level, a thunderstriker takes no penalty on attack rolls when using a weapon in two hands while wearing a buckler.
This ability replaces armor training 1.
At 7th level, a thunderstriker may make shield bash attacks with a buckler as if it were a light shield.
This ability replaces armor training 2.
At 11th level, when a thunderstriker uses his buckler to attack, he gains a bonus equal to the enhancement bonus of the buckler on both attack and damage rolls.
This ability replaces armor training 3.
At 13th level, a thunderstriker suffers only half the normal penalties for two-weapon fighting when using a buckler as his off-hand weapon.
This ability replaces weapon training 3.
At 15th level, a thunderstriker retains partial use of his buckler even
when using a weapon in both hands or in each hand (rather than losing
his shield bonus until the beginning of his next turn). He gains a +1 shield bonus
to AC and may apply the benefits of any feats he knows that require the
use of a shield, but does not benefit from any magical properties his
shield may possess.
This ability replaces armor training 4.
At 17th level, a thunderstriker no longer suffers two-weapon fighting penalties when using a buckler as his off-hand weapon.
This ability replaces weapon training 4.
At 19th level, a thunderstriker does not forfeit his shield bonus to AC from a buckler when fighting two-handed.
This ability replaces armor mastery.