Talus CorSec agent Taarna (4378 5176) tells you that CorSec cannot directly involve themselves in Selonian affairs, but a local den lead by the Selonian Kiki Dorente has come under dangerous influence. Perhaps an outside agent - yourself - can give them the aid they need? Travel to Kiki (4836 5094) and see what the situation is.
Your destination is a cave (4959, 5195) not far from Nashal. Once you arrive, speak with Kiki and the quest will update.
Next: Finding a Weakness