I was asked the question "How would a Guardian know who their Dragonlord is?" and "Would they know each other as Guardians?". I decided to go into more detail on that question here in case anyone else was wondering.

[b]Sensing the Dragonlords[/b]

From the time a Guardian was sent from the Celestial Plane (Where the Gods live) to the Earthen Plane (where the people are), the Guardians have been able to sense their charges. Each Guardian is able to sense where their Dragonlord is. Think of it like an internal GPS system. This allows them to hone in on the Dragonlord they've been sent to protect, even if they were clear across the continent. 

[b]Sensing other Guardians[/b]

Guardians would be able to see each other's true forms. Due to the warnings of their masters, they would not be able to speak of this out loud, of course, but they would be able to recognize each other with a glance.