Gravo can be found in the Old Camp (Shadow).
You: How's it going?
Gravo: Ah, I get ya. This place'd make you distrust your own mother. But yeah, I'm doin' all right. Finally got outta those bloody mines.
You: How do you get by, then?
Gravo: I'm helpin' folks solve their problems.
Gravo: If you ever find yourself in trouble with the wrong people, I can help you set things straight.
You: Can you help me, then? I think I'm in trouble.
Gravo: I think I can. But I'm warning you - it'll cost you.
You: How can you set things straight?
Gravo: All right, let's say you've gotten yourself into trouble with Thorus. Best to never let it come to that, but hey, you never know, right?
Gravo: Thorus is stubborn as a mule and if you fall outta favor with him, he won't talk to you anymore. That's bad news.
Gravo: Lucky for you, there's me, Gravo, and I know everyone - even the folks whose word means somethin' to Thorus.
Gravo: I tell 'em you're a fine lad, they pass it on to Thorus, and click - all's well that ends well.
You: Can you point me to the key players here in the camp? The Shadows?
Gravo: Ahh ... lookin' to score a few points, are you?
Gravo: Well, Diego's the top dog, but you know that already. His most trusted men are Fingers, Whistler, and Sly.
Gravo: Then there's Dexter and Fisk, our fences - they sell their stuff down at the marketplace. Everyone buys from 'em, even the warders, so that gives 'em a bit of sway.
Gravo: Last but not least, we got Scatty - runs the arena and decides who can fight and all that. Lots of folk owe him ore - he's someone you'll want to stay on the right side of.