Well, This Basicaly Leaves You With A Simple Choice: Atempt To Join With The Outlaws, Or Atempt To Rescue The Slaves...

Atempt To Rescue The Slaves

Not all of your new skills are without some drawbacks: such as Rules: Personal: Ethics: which kicks in in this case and reminds you that siding with the Outlaws would be an Evil act and probably confer the Outlaw status on you as well, making you even more of a target for adventurers...

So, you have to rescue the slaves, that's going to be tough, there are three outlaws, each of which is near, at, or slightly above your level, and there is no convenient trap this time. Meanwhile, the slaves are all either significantly lower level or classes that are garbage in combat. You need a strategy...

Three basic strategies immediately present themselves as possibilities:

1: Check your captured Rogue for items that can turn the tide:
The Rogue had that vial of knockout mist, maybe she has other tools that can help...
2: Gather a horde of Rats:
You can use your "Aura of Leadership" Special Ability to collect a large number of the rats that infest the sewers and sic them on the outlaws, the drawback here is that the Rats would be pretty indiscriminate, and would probably kill the slaves too.
3: Pretend to join the Outlaws, then Betray them from within:
You have the Rogue to use as a bargaining chip, you can negotiate 'joining' the outlaws, then rescue the slaves when their guard is down...