There's a moment of hesitation, as the party had mostly expected the sorcerer to do the talking, but Setarra steps up to speak, flowing in quickly. "You will find that we are far more than ordinary mortals, I suspect. My allies and I are quite capable in combat, and, together, have slain many powerful foes, such as..." she thinks, quickly, then smiles, "A pack of storm giants, guarding a treasure we wanted, in a northern country. Weak and pathetic though they are, compared to the might of the fire giants, but still formidable foes,"  bluffing effortlessly, earning a nod from the fire giant, who probably expects her to exaggerate, but clearly appreciates the pandering. "Hmmph. Very well, we'll see how you fare, then. You'll go out with the next raid, tomorrow night, to show us what you're capable of."