There are two notable Red dragons currently residing within the reach of the Cult of Tiamat. One of them, Klauth, has already had a small reference in our campaign. He is considered too dangerous to use, as he is notorious for killing other dragons, chromatic too, to advance his own goals.
The other one will soon be referenced in the campaign. He is very powerful and doesn't interact with the world much. Also he's been asleep for about 52 years. His layer is, as Mell fears, within the volcano called The Black Curtain, east of Zerakas tol.

Red dragons to me are the boring ones. Blacks are cruel, whites are savage, greens are deceitful, blues are militaristic. Reds? Greedy and bad. Meh.