Zerg
Unit Summaries
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The Drone
The drone is the heart of the zerg army, gathering the resources the swarm needs for its conquests. An overabundance is better than a scarcity of these guys. You should have at least one or two working each mineral cluster and at least four harvesting Vespene gas (depending on the distance).
The Zergling
Small and cheap, these guys are the backbone of the Swarms ground forces. Most ground battles are decided by whoever has the most of these. They hatch in pairs of two, making them fast efficient killers for the swarm.
The Hydralisk
Arguably the most versatile unit in the game, the Hydralisk is found in just about every battle the Swarm fights. With their ability to attack both ground and air, the Hydralisk plays a vital role in the survival of the Swarm.
The Lurker
The Lurker is an enormous asset to the Swarm due to its ability to burrow and attack. Zerglings are eaten alive by these things. Unfortunatly, these brutes can't attack the air. They are hatched from Hydralisks for a heavy price.
The Mutalisk
The Mutalisk is also considered one of the most versatile units in the game. Large packs of these can devestate any base within seconds and their awesome speed make them perfect to rush from one base to another to defend. Since these guys don't have a lot of strength, hit and run tactics often work more to your advantage.
Scourge
Scourge are little kamikaze fighters that slam into other air units and explode. Though I rarely use them, they are perfect for guarding against drops and taking down capital ships. Five of these things can take down a carrier.
The Queen
Queens are arguably the best "spell" casters in the game. With a variety of spells to hinder their opponents and their ability to capture damaged Command Centers, they are a vital part of the Zerg Swarm. Broodling can devestate a terran or protoss defense.
The Ultralisk
The Ultralisk is quite possibly the best land unit in the game, loaded with a whopping 300 hit points and 26 damage points when they are upgraded. The strength of the Ultralisk doesn't lie in its health or damage points though. It lies in your opponents perception of them. Most people will concentrate all their fire on the Ultralisks, letting smaller, weaker units get to the front and cause the real damage.
The Guardian
Guardians are large, slow moving air-to-ground fighters that are perfect for razing island bases. Their range is matched only but the upgraded goliaths, crushing everything else with ease from afar. They hatch from a mutalisk, similar to lurkers.
The Defiler
Defilers are the other "spell" casters that help the Swarm. They are the mark of a true expert: it takes some serious micromanagement skills to use these guys effectively. Their spells are pretty good, but with all things considered, I'd rather have a templar...
The Devourer
Devourers are air-to-air fighters that were designed to cripple capital ships and take out large groups of other air units. They release acid spores that slow and weaken the ships movement and firing rate. Similarly to the Guardian, they hatch from mutalisks.