Pyromancer's Grimoire

Wondrous item, very rare (requires attunement by a wizard)

This scorch-marked tome reeks of ash and brimstone. Though warm to the touch, it never burns the hand that opens it. When found, the book contains the following spells, which are wizard spells for you while you are attuned to the book: fireball, fire shield, fire storm, hellish rebuke, scorching ray, and wall of fire. It functions as a spellbook for you, and you can use it as a spellcasting focus for your wizard spells. While attuned to the book, you know the produce flame cantrip, which is considered to be a wizard cantrip for you.

The grimoire has 7 charges for the following properties. It regains 1d6 + 1 expended charges daily at dawn. If you expend the last charge, roll a d20. On a 1, the book crumbles into hot ash and smoke.

Blazing Transmutation. While the grimoire is on your person, you can expend 1 charge to change the damage type of a spell you cast to fire. A flammable object hit by a transmuted spell ignites if it isn’t being worn or carried. The spell’s visual and sensory effects are transformed accordingly, taking on the form of embers, flame, or searing heat.

Flame Casting. While the book is on your person, you can expend 1 or more of its charges when you cast one of the spells listed above. For each charge you expend, the level of spell slot needed for that casting of the spell is reduced by 1. If you reduce a spell's slot level to 0 in this way, you can cast the spell from the book even if you don't have it prepared.

Ignite. When you deal fire damage to a creature, you can expend up to 2 charges to attempt to set the creature ablaze. The creature must succeed on a Dexterity saving throw against your spell save DC or catch fire. While burning, the creature takes 1d10 fire damage per charge spent at the start of each of its turns. A creature can extinguish the flames by using its action to smother them. The fire also goes out if it is doused, submerged, or suffocated.

Alight, flame—burn away the old and withered, and let something new and beautiful rise from their ashes.