Heroic Aid is a consumable item that summons 30 assorted Mercenaries when it is activated.
This consumable summons the equivalent of the Rare quality version of three different types of consumable units in one item.
Consumable units summoned:
The only way to acquire this item, is to create a civilization in Age of Empires Online. Each Civilization starts with 5 of them on the Project Celeste server. After those 5 are used up, the only way to get more would be to delete the civilization account and make a new one.