Anti-Venom

Arrow's life had always been normal, and he didn't expect that to change when he came of age for venom growth. Only, it never grew in. This wasn't what he was expecting, but he wasn't the only dragon different from the rest, but a female with the gift of venom from the rival tribe, caverndwellers. Could this "venomed" caverndweller give Arrow all the answers he'd been looking for? (I probably missed a couple of name changes)