If you would like to complete the Glory of the Hero Achievement for the Red Proto Drake, we will be running Tuesday and Thursday evenings. Check the in-game calendar for specific time and to sign up.
To get this Dungeon Achievement, you must obtain certain achievements from all the level 80 dungeons while on Heroic. The Prize for completing this, besides bragging rights, is the Red Proto Drake. (See Pets and Mounts in the Gallery for picture.)
The more the better, so if you are close to 80 and want to join the fun, get to leveling.