Elder

Information
Elder-Enemies are usually enormous, ancient, and highly evolved forms of the lesser enemies. They never travel with other Elders but they can produce a large number of Dire-Enemies which in turn produce spawnlings causing lone Elders to rapidly turn into an army.

Strategies
As with the Dire-Creatures, enemies summoned by the Elders are distractions. However elders should still be singled out or reduced to a small party before you attempt to bring one down, and even when fighting one you should still maintain your distance as much as possible.

Another good approach is to rush the Elder before they have a chance to spawn all of their units. After attacking attempt to flee, during their pursuit they may spawn units which will slow them down allowing you to create distance between yourself and them. Repeat this process and hopefully they will die before they run out of troops, of course this leaves you with an army to deal with afterwards.