There is some neat feat or skill trick that allows two rouges to flank an enemy and work in tandem to allow higher flanking bonuses or more damage or something. I cant remember the name or the book its in. Any Ideas?
There are several other teamwork benefits mentioned for the Nightsong Infiltrator and the Nightsong Enforcer, granting skillbonuses, spotbonusses, and flanking bonusses, but this is the only one giving sneak attack bonusses. (NB: to other characters!)Complete Adventurer p.64 said:Teamwork Sneak Attack (Ex): Beginning at 4th level,
a nightsong infiltrator deals an extra 1d6 points of damage
when flanking an opponent or any time the target would
be denied its Dexterity bonus. Any ally of the infiltrator
who is also flanking the infiltrator’s opponent deals this
extra damage as well. This extra damage applies to ranged
attacks only if the target is within 30 feet. It increases to
2d6 points at 8th level. See the rogue class feature, page
50 of the Player’s Handbook. If a nightsong infiltrator or
her ally gets a sneak attack bonus from another source
(such as levels of rogue), the bonuses on damage stack.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.