Envy frowned in thought, his clouded eyes staring ahead. "Using one gem to track another is possible, yes. Especially if each one is encased in his particular strain of magic. It won't be easy, but it can be done. And if it works, it won't be exact, but will give you enough of a location to get closer. I assume you can sense traces of his magic by other means, otherwise you wouldn't have wound up in Ziad."

[i]Why Ziad, though?[/i] Envy wondered. "I only ever sensed one magical source in Ziad that didn't belong to my family. ─This─ family, I mean. Not my blood relatives. So I wonder why it wound up being your double that you followed and not the mastermind behind her. She has his power?" He stared ahead, thinking, curious. 

"As to your face, yes, that can also be done. Ruli is actually quiet adept in enchantments. Its the category of magic he took to most when I was teaching him. But the unfortunate fact is that we have no supplies here. Not for tracking or enchanting. Everything was lost with Ziad." He admitted, tilting his head, so his whole ear was pointed more toward her. "I can add it to the list of things for pick up, but it may be a while before we have everything. Days, maybe."