ranged sneak attack damage
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When most people think of Sneak Attack Damage, they get blinded on flanking. I feel like people forget the "when an opponent is denied his Dex to AC" part, which covers more than just flanking. I'm currently running a Ninja in Pathfinder, which is a rogue-alternative class, and I do all kinds of Sneak Attack Damage throwing shuriken. The Vanishing Trick Ninja trick is a god-send in this regard. If you're invisible, you're denying them their Dex. This was mentioned already (invisibility) as well as having a high Initiative to go before them which makes them Flat-footed. But there are also other ways, all-be-it not ranged, like Imp. Feint, which denies an opponent his Dex and lets you feint in combat as a move action. Your Bluff should be maxed as a Rogue anyway. Fear effects and poisons are also powerful agents. Use them to Stun and Paralyze. I multi-classed into Monk for the Imp. Unarmed and Flurry of Blows (which you can use shuriken with) and Stunning Fist. See what I did there? If you have a caster, push for Sleep, Blindness, Slumber and the like. I'm not as brushed up on the spell side, but our caster has basically flash-bang spells that blind everyone in a room. Also Dirty Tricks allows you to blind. I'm only Monk 2/Ninja 7 and I have cleared entire rooms in a single round with damage output and maneuverability. Just make sure you go first, throw a handful of shuriken and do your Sneak Attack Damage. If you want, grab Opening Volley to ensure you don't miss when you move in for the kill. This is all assuming of course you're playing a Ninja.