Aegis of the Immortal

The Aegis of the Immortal ( pronunciation_aegis.mp3 EE-jis) is an Item that drops from Roshan.

Though difficult to acquire, it can easily sway any battle, bringing back the hero who holds it with full HP and Mana.

Additional Information
The aegis will disappear when one of the following things happen, be it in a player's inventory, or still on the ground where Roshan dropped it:
 * When Roshan respawns 8-11 minutes after being slain.
 * When the Aegis wielder dies and reincarnates, using up the Aegis.
 * When 5 minutes pass since the aegis was picked up by a hero (not 5 minutes after Roshan was killed).

This means it is impossible for multiple Aegis to exist in a match (without the help of cheats).

Lore
According to the characters in the Dota 2 Comic "Are We Heroes Yet" Roshan stole the Aegis of the Immortal from a Shop Keeper whom he killed. The Gods then cursed Roshan to have his life and treasure stolen repeatedly as punishment for his crime.

Trivia

 * Aegis was previously an ordinary recipe item that contained three charges. After it was removed, it was then given as a droppable item from Roshan.
 * In Greek mythology, an Aegis that was described as "ageless and immortal" was presented to Zeus.