[[File:Permafrost_dlc.jpg|The DLC that was released in 2016|thumb]]
* The theme was officially called "Permafrost" due to a 2016 DLC called the "Permafrost Pack" which unlocks all the Permafrost costumes when purchased.
* Permafrost are grounds that have remained frozen solid for over two years or more which is probably also where the theme was derived from.
* Prior to the release of the Power of the Ancients expansion (3.0), the Permafrost costumes was available in the Seamstress for 400 gems each before being Defender Pack-exclusive costumes.