The Stormcast are the Chosen Warriors of Azyr, mortal souls plucked from the mortal realm for acts of valur, defiance, heroism or Sigmars divine will to be torn asunder and reforged into his legions of lighting, flesh and Sigmarite wrought weaponry. Scalewise they fit alongside Space Marines and Primaris as heroic sized infantry, with your standard Stormcast model occupying a 40mm base they have a good structure to build characterful conversions from.

By sharing a size profile with Space marines your bits pool expands massively, there are interchangable parts with most Space Marine upgrade kits, and the new Thunderstrike hosts have the perfect wrist sized to accomodate Space Marine weaponry making sourcing fancy looking weapons all the easier.

With the sheer scope of the Mortal Realms you can be as divergent from the Hammers of Sigmar as you like and still find ways of tying the force back to Azyr, and in this you can create something truly unique