How to obtain the Crafting Motif and Style Material:

Motif:

The Stalhrim Frostcaster motif book is available for purchase on the Crown Store during the New Life Festival event. Both the book and its chapters are unobtainable in-game.
• December 15th, 2016 to January 4th, 2017 – A bundle containing the full Stalhrim Frostcaster motif book + 5 Mimic Stones was priced at 1600 Crowns.
• December 14th, 2017 to January 1th, 2018 – A bundle containing the full Stalhrim Frostcaster motif book + 5 Mimic Stones was priced at 2000 Crowns.

Style Material –
Stalhrim Shard:

This style material is only obtainable through deconstructing Stalhrim Frostcaster-styled gear, originally crafted using Crown Mimic Stones. Stalhrim (raw material) is unobtainable.

 

Sets in this style:

Light:

[None]

Medium:

[None]

Heavy:

[None]

Variable:

[None]