Darguun Mauler( Races of Eberron, p. 108)
The memory of your people's lost glory drives your brutal mastery of the weapons of Darguun.
Humanoid (goblinoid), proficiency with flail or heavy flail, region of origin Darguun,
You treat the dire flail and the spiked chain as martial weapons. As well, you gain a +1 bonus on damage rolls when making an attack with a flail, heavy flail, dire flail, or spiked chain as long as you do not move during the round in which you make the attack. If you have any of the following feats for the flail, heavy flail, dire flail, or spiked chain, you can apply the feats' effects to all three weapons: Improved Critical, Weapon Focus, Weapon Specialization, Greater Weapon Focus, Greater Weapon Specialization. Additionally, when you spend an action point to influence an attack roll made with a flail, heavy flail, dire flail, or spiked chain, you also add the result of the action point roll to your damage for that attack.