The Writ takes the form of a scroll bound by wax, while using the scroll you have resistance to fire.

The Writ has 10 charges, which are used to fuel the spells within it. With the Writ in hand, you can use your action to cast one of the following spells from the Writ: Fire Bolt (1 charge), Continual Flame (1 charge), Wall of Fire (2 charge), or Fire Storm (8 charges). No components are required.

The Writ regains 1d6 + 4 expended charges each day at dusk. 

Notes: Resistance: Fire