Sentinel factory

The Sentinel shop, also known as a Sentinel factory, is an underground variant of the Forerunner Sentinel manufacturing facility, capable of constructing Aggressor Sentinels and Super Sentinels. The Sentinels exit the facility via a tunnel connecting the facility to its exterior. Like the Protector plant, the square-shaped exit is characterised by four pillars at each of its corners, but the Sentinel shop possess two additional protrusions on the exit's inner walls. Two such facilities were on Harvest, and another was within the shield world Etran Harborage.

Gameplay

 * Sentinel: A flying Forerunner unit, the Sentinel will inflict corrosive damage with a dangerous beam weapon.
 * Cost: Population 1, Tech level 1, Supplies 100
 * Purchase cooldown: 15 seconds
 * Super Sentinel: The Forerunner Super Sentinel has the unique ability to slow down enemy units while preempting their attacks.
 * Cost: Population 2, Tech level 2, Supplies 250
 * Purchase cooldown: 30 seconds

The Sentinel shop appears exclusively in the Halo Wars Skirmish levels Repository and Glacial Ravine. Unlike other bonus buildings, the building cannot be garrisoned. Any player with a unit nearby may access its menu and purchase Sentinel units, which can then be added to their forces. The Sentinels are produced instantly and must go through a cooldown timer before being able to produce a new unit, much like the UNSC leaders' Support Abilities.

The visually-similar Protector plant is a smaller Sentinel shop that produces Protector Sentinels instead of Aggressor Sentinels and Super Sentinels.

List of appearances

 * Halo Wars