TERRAN TACTICS
Author: Daktakpaklak

Nearly all the Terran units are ranged attackers. As a result, the Defiler's Dark Swarm is unarguably the most useful ability when facing a tight Terran defense. Cast Dark Swarm along the edge of a Terran's defense and attack with Hydralisk and Zergling. Target the Firebats and Siege Tanks first (remember that Siege Tanks are not affected by Dark Swarm). If the Firebats come under the protection of the Swarm, use Zergling to take care of them. By consuming Zergling, your Defilers can effectively Dark Swarm the entire base. When using Hydralisk, be careful not to Dark Swarm enemy units/buildings unless melee attackers (ie: Zergling or Ultralisk) are at hand.

Plague is another extremely useful Defiler spell. Although Medics can restore a Plagued unit, damage is still taken. There is no better way for a Zerg player to tear down a fleet of Battlecruisers than with Plague!

Always have a good force of Queens out and about. Use them liberally: spawn broodlings in every vechile and Medic you come across. Make the Terran player paranoid to deploy his Siege Tanks and Goliaths. Parasite Critters. Try to infest a Command Center, and use Infested Terrans against enemy defenses. Don't bother parasiting enemy units, as the Medic's Restore can kill the parasite.

The Terrans are extremely vulnerable to Ultralisk. Ultralisk with fully-upgraded armor are impermiable to Wraiths, infantry, and Vultures (since Vultures attack with concussive damage-type). Even Goliaths will only do 6 HP of damage. The biggest threats to Ultralisk are Siege Tanks, Spider Mines, and Battlecruisers. When engaging a Terran's defenses, target the Siege Tanks first. Next, hit lone infantry units, focusing on Firebats before Marines. Ignore the Bunkers by simply running out of their range; the units inside will have to hop out to attack, at which point they can be quickly dispatched. Supporting Ultralisk with Dark Swarm or against air units with Devourers, Scourge, or Hydralisk will solve the Battlecruiser problem. Be very wary of Spider Mines. If your Ultralisk are tightly packed, only a handful of mines can ruin your day. Once the perimiter defeses are down, bring in a few Overlords and use Hydralisk or Zergling to root out the Mines before cleaning the base off.

Devourers work extremely well against Battlecruisers; the Acidic Spores both nullify the Battle Cruiser's heavy armor and slow down their attack rate. Guardians are a Terran player's worst enemy, but be sure to support them against air units. Accompany your Guardian force with a pack of Hydralisk or some Scourge, and a few Overlords to reveal cloaked Wraiths.

Be wary of Science Vessels equipped with Irradiate. If you see a Science Vessel, try to destroy it immediately. Irradiate can be a real hastle, especially when used against expensive units like Queens and advanced air units. Ultralisk are strong enough to survive a few irradiations, but they are still vulnerable to its effects. If a unit is irradiated, isolate it from the swarm immediately! Irradiate is a ranged attack, and will affect surrounding units with devastating results. When a ground units has been irradiate, burrow it immediately; Irradiate does not have its ranged effects when the irradiated unit is burrowed.  If you can't burrow it, try to run/fly the unit into a pack of Terran infantry.

Valkyries and their spalsh missiles chew up Scourge. Don't waste a whole pack of Scourge if a pair of Valkyries are in the area. Instead, try hit the Valkyries with Plague or Hydralisk. When facing Valkyries in the air, spread your units out as much as possible. A pack of Devourers can tear through Valkyries.