The rarity of The Brood Queen Set is Common, and been equipped it takes a “Bundle” slot. At this moment the item is available for trade.
The Brood Queen Set is a skin for Broodmother. The skin was added to the game on Invalid Date, it was created by 7thBattery.
The Brood Queen Set is currently one of the most popular skins, but it is rarely seen in the game due to its high price.