Overseer

The overseer is a zerg unit evolved from the overlord.

Overview
The mutation gives it the ability to detect cloaked and burrowed units, along with an increased sight range.

Game Unit
The overseer is faster than an overlord.

The overseer's sight radius expands when it stays still and shrinks when it moves. However, the detection radius does not increase.

Development
Overseers used to have similar abilities to the overlord, but those were removed.


 * Excrete Creep
 * The Overseer can create a small patch of Creep, the radius steadily expanding as long as it remains stationary. This ability is researched at the Evolution Chamber.


 * Slime (also known as "Corrupt Minerals")
 * The Overseer can drop a non-attacking slime creature, temporarily disabling resource nodes and watch towers. The slime can be attacked and removed by other forces. The minerals can be covered as they're being harvested, enabling raids which slow down an enemy's economy. The creature must be killed before the minerals can be accessed.
 * This ability took time to "cast" and had a small cooldown timer.
 * Summon Nydus Worm
 * The overseer lost the ability to make nydus worms as of March 2009.