In Maximum XCrawl (which uses the Pathfinder engine), the specialist class (basically a Pathfinder rogue) deals extra sneak attack damage when flanking.
I play a specialist in a Maximum XCrawl campaign, and the DM has ruled that constructs are immune to sneak attack damage and can't be flanked, and the DM has started throwing many, many constructs against the party. I've gone from dealing foes 1d4+2d6 points of damage to dealing just 1d4 points of damage. On Lv. 19, I'd go from dealing 1d4+10d6 to just 1d4.
My character is a Lv. 3 Halfling, which means all my weapons deal even less damage. As for ressources, my character only has about 100 Gold Pieces, which is not a lot for XCrawl. Further, our GM heavily discourages anything outside the core XCrawl book, which means I am very restricted in my choice of gear.
Currently, I have a Rapier which deals 1d4, Throwing Knives which deal 1d3 and a concealed blade which deals 1d2. As you see, these numbers are anything but impressive if my 2d6 bonus falls short.
How can I be useful to the group beyond dealing sneak attack damage?