The Molten Soul collection contains two premium cosmetics for Sienna Fuegonasus: the Immolator's Casket hat and Blazing Soul Raiment skin.

The cosmetics can be used on Sienna Fuegonasus’ Unchained career.

About the cosmetics:

Immolator’s Casket - Hat
Some fury cannot be tamed, only caged. When the wizard is about her work, the air stinks of hot metal and seared flesh.

Blazing Soul Raiment - Skin
Even for Bright Wizards, this garb suggests the primary purpose is containment, rather than clothing.