Take the Archery Powerset (theme: trick arrows) and expand it into a Hunter Powerset (theme: tricked-out archaic ranged weapons). It should be to archaic ranged weapons what Munitions is to guns. (Exception: I want crossbow weapon skins for the Munitions powers.)
Start by moving the boomerang and bola powers from Gadgeteer to Hunter. Add some Lariat variants of the Brick's Chain powers (technically Melee powers; but they're still thrown weapons) and Throwing Knives variants of the Martial Artist's Shuriken powers. Give the Throwing Knives powers a Weapons Costume category, and allow it to include knives, disks, baseballs, footballs, javelins, spears, and other assorted throwing weapons.
Give some of the non-boomerang thrown weapons a Strike From the Shadows Enhancement that lets them benefit from stealth the way the boomerang powers do. In particular, there should be an archery attack and a throwing knives attack that can be turned into assassination strikes in this way. It's OK if they lose some of their normal strength in the process, as long as they hit especially hard when launched from stealth. And add Stealth as a stand-alone power in this set: you still get it for free with the Night Warrior passive; but you can also take it independently if you want to use a different Passive and aren't interested in Shadow Strike.
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Gadgeteering/ munitions - Cloaking device
Martial Arts - Night Warrior
Sorcery - Spell of Invisibility ( I know there is an area effect stealth power already)
Void - Shadow Walking
regardless of what your build was. This resulted in some combinations that were quite frankly overpowered. Making Stealth reliant on a specific passive actually restored balance to the power. Now you can't combine it with the most overpowered passives in the game, instead you are forced to use a passive that is one of the most well rounded passives available, as far as offensive passives go...
Focused Shot and Sniper are already ranged counterparts for Shadow Strike: you basically only get to use them at the start of a fight, but they do enough damage that even some fairly high-level mobs are dropped before the fight even begins. The mechanics by which they work are slightly different, in that they have fairly lengthy charge times that are easily interrupted and they don't have any special benefits from being stealthed; but the basic premise of taking out a powerful target in one shot but only if they're not aware of you is already there. That's why I suggested that a Night Hunter Passive might trade out Shadow Strike for Focused Shot.
Finally, add Boomerang variants of the various "trick arrow" powers: Sonic, Taser, Explosive, Gas, and Medicine.