Drow Skirmisher( Races of Eberron, p. 109)
Your experience with the guerrilla-style combat of the deep jungle grants you mastery of the weapons of the drow.
Drow, region of origin Xen'drik,
You treat the Xen'drik boomerang, the drow scorpion chain*, and the drow long knife* as martial weapons. As well, you gain a +1 bonus on damage rolls when making an attack with a drow long knife or a drow scorpion chain as long as you have moved more than 5 feet under your own power during the round in which you make the attack. For example, being bull rushed 10 feet isn't sufficient to grant you the extra damage from this feat. If you have any of the following feats for the dagger or short sword, you can apply the feats' effects to the drow long knife: Improved Critical, Weapon Focus, Weapon Specialization, Greater Weapon Focus, or Greater Weapon Specialization. If you have any of the same feats for the spiked chain, you can apply the feats' effects to the drow scorpion chain. Additionally, when you spend an action point to influence an attack roll made with either a Xen'drik boomerang, drow scorpion chain, or drow long knife, you also add the result of the action point roll to your damage for that attack. See page 119 of the EBERRON Campaign Setting. *New weapons described in Chapter 8 of this book.