The Burning One

Your patron has the ability to control easily the most volatile element: fire. You've made compact with such a being that allows you to channel great waves of fire and destruction while also fending off those who wish to harness your flames. Such beings can be noble creatures yet, just as easily, they can be wrathful and blinded by rage and destruction. Examples of a Burning One patron are archdevils, demon lords, elemental lords (fire), phoenixes, and dragons.

Expanded Spell List

1st-level Burning One feature

The Burning One 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.

Burning One Expanded Spells

Spell Level	Spells
1st	absorb elements, cure wounds
2nd	flame blade, dragon's breath
3rd	flame stride, fireball
4th	wall of fire, fire shield
5th	flame strike, geas

Spreading Flames

1st-level Burning One feature

You gain the ability to change the damage of your cantrips and weapon attack to fire. In addition, whenever you deal fire damage creature, you may have a creature within 5 ft. of the target suffer fire damage or have its wounds cauterized. The damage or healing is equal to 1d4 + your Warlock level. 

You can use this feature a number of times equal to your proficiency bonus, and you regain all expended uses when you finish a long rest.

Fire Mind

6th-level Burning One feature

Your patron’s powers protect your mind with psychic flame. You have advantage on saving throws against charm, frighten, or mind-reading effects. Any creature that attempts to read your mind, charm, or frighten you suffers 3d10 fire damage.

In addition, whenever a creature becomes charmed or frightened by you, you may choose to make them suffer 1d8 fire damage at the end of each of its turns. A creature that is charmed or frightened is unaware of the damage they suffer from this feature. 

Fire damage dealt with this feature overcomes resistances and immunities.

Incombustable

10th-level Burning One feature

Your body becomes a conduit of flame. You have resistance to fire damage. If you dealt fire damage on your previous turn, you have immunity to fire damage. Your spells and attacks ignore resistance to fire damage.

Ashes to Ashes

14th-level Burning One feature

Your patron ignites a truly dangerous power within you. You may empower your spells or attacks by burning away at yourself. Whenever you cast a spell or make a successful attack, you may use a special action to empower it. The spell or attack deals an additional amount of fire or force damage (your choice) equal to 4d12. Your maximum health total is reduced by a number of 1d12s for each time you've used this feature and the amount rolled is added on to the additional damage. The reduction to maximum health from this feature ends after a long rest. 

In addition, whenever you expend a Warlock spell slot, you may force a number of creatures equal to your proficiency bonus to make a Wisdom saving throw against your spell save DC or become frightened for 1 minute. Creatures frightened this way suffer 2d12 fire damage in addition to any damage they may take from the Fire Mind feature. If the creature ends its turn in a location where it doesn't have line of sight to you, the creature can make a Wisdom saving throw. On a successful save, the spell ends for that creature.

If this feature would cause your hit point maximum to be reduced to 0 hit points, you die and burn away to ash.