The subject of this article originates from non-canonical sources. To find out about what is considered "canon" see LOTR:Canon.
The Spider Queen and Swarm are four units from the Misty Mountains faction of The Lord of the Rings Strategy Battle Game, available for $45.00. The "Swarm" consists of three tiny groups of spiders, which look similar to the Spiderlings from The Lord of the Rings: The Battle for Middle-earth II. Each of them have the same groups and rocks on the unit circle as scenery.
Greatest amongst the spiders of the Tawar Dúath, the Queen is not only the largest, but also the most cruelly intelligent. Though she refuses to consider herself a servant of the Necromancer, their dark designs coincide frequently enough that they can make common cause.
This boxed set contains 1 Spider Queen and 3 Swarm.