You have made a pact with the Aspect of Flame, an ancient primordial being of raging fire.

Expanded Spell List

The Aspect of Flame lets you choose from an expanded list of spells when you learn a warlock spell. The following spells are added to the warlock spell list for you.

Spell Level	Spells
1st	Burning Hands, Searing Smite
2nd	Flaming Sphere, Scorching Ray
3rd	Fireball, Melf's Minute Meteors
4th	Fire Shield, Wall of Fire
5th	Flame Strike, Immolation

Burning Soul

Starting at 1st level, you learn the fire bolt and control flames spells, which count as warlock cantrips for you. Whenever you roll for fire damage, you can use your reaction to reroll a number of dice equal to half your proficiency bonus and use the higher result.

Walk through Hell

Starting at 6th level, you gain resistance to fire damage, and you can ignore fire damage from your own spells.

Smoldering Magic

Starting at 10th level, you can roll a d6 whenever you cast a spell with a Warlock spell slot that deals fire damage. On a 5 or 6, you recover the spell slot used. Once you have recovered a spell slot with this feature, you cannot do so again until you complete a short or long rest.

Firestorm

Starting at 14th level, you can overwhelm your enemies with your flames. When you cast an instantaneous spell that deals fire damage and targets an area of effect, creatures within the area who are not benefiting from resistance or immunity to fire become vulnerable to the spell's fire damage. Once you have used this feature, you cannot do so again until you complete a long rest.