Page 23 Daishain's D&D 5e Side Stories The Sage says...
Silas hesitates before speaking. "I would be glad to teach you, but I suspect I will be a poor mentor for quite some time. This mess with the cult has had me on the move all across Faerun, and I do not see that ending for either of us any time soon."
He pulls out a map of central Faerun, indicating a particular mountain in the Earthspur range. "If things quiet down, and you wish to seek me out, my home is here." Pointing to a nearby lake he states, "The main entrance is underwater, look for a tiny island near the western shore, The passage is at its base. Even if I and my mate are not home, Jad or some of his kin will be, and they will know to make you welcome."
"If we are to pursue this, there is something you should know of me Velon. It is not a secret, just not something readily shared, feel free to speak of it with the others. If you have not already, you will likely notice significant differences between me and most dragons, particularly in regards to demeanor. This goes deeper than simple impatience."
He indicates his human body, "This form is not the one I consider my own, it is not the one my mate knows as mine, nor the one my children recognize. I am a dragon, but this face is the one I was born with, and Silas is the name I was given at birth. I speak and act more plainly than most of my kin mainly because I was not born among them."