The idea with this new Mystery Box was going to build on the achievement of this earlier-released Chaos Order Mystery Box. To this end, GGG determined on "another double themed box", this time (obviously) fire and ice. The PoE trade currency report starts with a discussion about designing a dual-themed armor set being a struggle that moved through several iterations before the final design was discovered.

The Way the box could be handed out to players was exceptional along with the way it had been executed in WftA is something Which Will be included in further mystery boxes moving forward:

After much debate, an idea emerged to create it so that you could combine fire and ice microtransactions to the carve microtransactions. This served the dual-purpose of becoming both thematically-appropriate and an intriguing and surprising way to soak up copies from the box.

We're enthused about the idea and thought it's best to keep it a secret at the initial launch of the box. We felt that the box represented great value even without mentioning the separation microtransactions and that trying to online shop convey it may confuse the statement.

We were pleased to leave it as a wonderful surprise for gamers who would find that there was added value beyond that which they initially open from the boxes. We were curious to find out what the reception to the combining technology would be, without us having hyped up it with marketing.How to Get Started in the World of Warcraft.