I agree that Hex seems fine so far.
My biggest question, and one I assume is address elsewhere in the text, is how big of an area Hex can make invisible, and how selective it can be. Apparently it was enough to get Jhuz out of the camp.
Hex talking about apples, not eggs: He lied about the first part (the apple's not poisoned). It makes me wonder what else he's lied about.
Since the Servants of the Eight were legendary, and Jhuz knows about them and their talent, it seems odd that a couple of things would be as they were earlier in the story. Not horribly unfixable, but odd. The first is that Jhuz noticed things moving that could easily be explained by an invisible person, and he doesn't even think about the possibility. The second is the body-guarding routine; I would think it would change some from our routine it there was a serious chance of invisible people. For one thing, Jhuz likely would't be left to wander into his tent until either it's been checked by the guards and/or bodyguards, or the bodyguards would stay very close while he was in the tent. In fact, they'd probably be in there with him. I'm sure some other changes would be made as well; you might want to think of a few. The alternative might be that nobody really thought Jhuz would be worth a contract, so they didn't bother doing the job as well as they ought to,
Finally, I wonder about the use of the word "poison." It can certainly stand, but it makes me think of fatal poisoning. I don't know off-hand what might be a better word, either.
Overall, it was quick and fun. I'm looking forward to reading more.