When the line must be held, you are the anchor on which your allies can remain steadfast. Enemies run at you only to die on your spears or blades.
Prerequisites: Constitution 13+, Endurance.
Benefit: You can set yourself for any incoming attacker, becoming a stalwart defender of your position. As long as you have not moved since last turn, you can choose to make your attack(s) of opportunity at any enemy entering a square you currently threaten. If you have multiple attacks of opportunity per round, you can use them at separate opponents that move into these squares, so long as you have attacks left.