Ravan looked between the two book traders, his expression a mask of neutrality. In response to Ruvria's explanation, he said. "Ah? Ah." And left it at that, for a moment.
So... the illegal mage believed this woman Ruvria to be responsible for the death of her people - at the hands of a demonic army, no less. That was something it took him some time to consider, and he did so as the meal progressed. His first instinct was to suspect everyone and work from there - but he quickly found holding suspicion against Ruvria to be untenable. Part of the reason was at the table with them - It seemed unlikely in the extreme that Helm's champion would be friends with a demon-cultist, especially one of such power that she could raise the armies of the Abyss. Ravan of all people knew that anyone could be fooled, but his own senses had sensed nothing touched by darkness in Ruvria's soul, and he had been specifically trained to ferret out such hidden, festering allegiances.
It seemed more likely that Ruvria had been made a scapegoat - perhaps there had been a third party, without or within of their society who had used her as a tool. The Traders were foreigners nearly everywhere, and foreigners made excellent targets for such stratagems. On the other hand, it might just has easily have been one of her own who sent her up the fabled river of sewage.
He smiled at the rest of them, wiping his mouth. He spoke again, his voice unfailingly polite. "I thank you for the food. It's quite delicious." He would have said the same had it tasted like rancid goat, of course, but in this case it was happily true. "I imagine you're wondering what I'm doing here. Those of you familiar with Jamean custom and society may know that I am a member of the Denavashor Daivat - that is, the Left Hand of Daivat, Daivat's Strong Left Hand, or a number of other similarly self-aggrandizing titles. The significance, however, is that I am a hunter of demons and their worshipers. Jasper has invited me to join you in your hunt, and I have accepted - but first, I must ask all of you if you wish this to be so." He smiled at them. "I ask this both out of courtesy and out of self-interest. If we are to work together, I must make sure we can trust each other, at least as much as trust can be established between new folk in so short a time. But I hope you will accept me - this is a vocation for me, not simply a duty, and it will be significantly more likely that I will succeed if I may accompany you in this matter. But now that I know a demon lord is loosed on the world, I will have to hunt him down in any case."