Guardian Fighter is a tank class, using his shield he has ability to build higher threat and mitigate high amounts of damage.
Main GFs Ability Scores are Constitution, Strength, Dexterity. His tactic skill is Guard allowing him to block series of incoming attacks. Class mechanic is strictly connected to class tactic, GF dont have stamina bar, instead he have Guard Meter on the left from character and after reaching level 10 he will be able to attack without letting his Guard down using At-wills changed to Shield Slam (restoring 5% of Guard Meter) and Aggravating Strike (sword attack above the shield taunting enemy) while guarding.
In addition his "Tab" skill Marks enemy also increasing threat you build while attacking him.
After blocking set amount of attacks Guard Meter will be empty and you wont be able to block until you will refill Meter with skills or attack boosted by talents.
Best races for Guardian Fighter are Halfling, Half-orc and Dwarf due to matched AS.
Effect of Ability Score on stat per point over 10:
Combat Advantage damage
Damage Over Time (DoT) resistance
Area of Effect damage resistance
Action Points gain
Companion stat bonus