Kaahmaal was a Shaarat'Kesh assassin I sent as leader of a strike team against my PCs in my last Eberron Game. He was assigned to follow them onto a Lightning Rail coach they were taking and strike quickly, using true strike and death attack (with some black adder venom for good measure) to slay the more powerful members first, and escape using Obscuring mist. Sadly, he was concentrated on the most, and died before he even got a second shot off.
(Rule 1: The guy dual-wielding the specialty weapons is getting nailed first by the group.

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Kahmall, Male Goblin Mnk5 Rog1 Asn1 Size: S Face: 5 ft. hp 43; Init +3 Spd 40'; AC 18 (ff 15, tch 17), *Siangham (1/2 Cold Iron/Masterwork/Small) +6 (1d4+1 20/x2 Primary or *Flurry of Blows +3/+3 0'/B (1d6+1 none/x0 Equipped M ) or *Unarmed Strike +5 0'/B (1d6+1 20/x2 Equipped M ); SA: Death Attack (DC 13), Evasion (Ex), Flurry of Blows (Ex), Ki Strike (Magic), Poison Use, Purity of Body (Ex), Slow Fall (20), Sneak Attack +2d6, Still Mind (Ex), Stunning Fist attack 5/day (DC 14), Trapfinding; Vision: Darkvision (60'), Normal AL: LE; Sv: Fort +5, Ref +11, Will +5; STR 12, DEX 16, CON 12, INT 14, WIS 12, CHA 10
--Skills and Feats: Balance +5, Craft (Alchemy) +8, Diplomacy +2, Disguise +8, Escape Artist +5, Hide +15, Intimidate +1, Jump +8, Knowledge (Arcana) +3, Knowledge (Religion) +6, Listen +5, Move Silently +15, Ride +7, Sense Motive +6, Spot +6, Tumble +12; Leadership, Two Weapon Fighting, Weapon Finesse
--Possessions: 1 Amulet of Natural Armor +1, 2 Siangham (1/2 Cold Iron/Masterwork/Small), 1 Flurry of Blows, 1 Outfit (Explorer's/Small), 3 Black adder venom, 1 Ring of Protection +1, 1 Unarmed Strike
Assassin - Known:
Level 1: Obscuring Mist, True Strike
He was accompanied by a bunch of fairly vanilla Rog4 goblins, and a Wiz5, who humorously lasted a lot longer than Khaamaal did, because of bad rolls by the party.