Flask of the Titans

Flask of the Titans is a consumable flask that increases the player's maximum health.

Source
Flask of the Titans is created by Alchemists with a skill level of 300.

is available:
 * as rare drop from General Drakkisath, final boss of Blackrock Spire
 * from the Sha'tar quartermaster with exalted reputation

Uses
This was once a staple recipe for raiders. It is useful to give this flask to the Main Tank when learning a new boss. The additional stamina will help him stay alive, and give the healers time to learn and react to the boss's damage profile.

Once the boss has been downed a couple times, you no longer need the flask; however, there's always a new boss to learn.