Cleric
Base Class: Cleric

You have began to study the chaos of the lava and magma in forsake of your religion 

Domain Spells

1st-level Order Domain feature

You gain domain spells at the cleric levels listed in the Order Domain Spells table. See the Divine Domain class feature in the Player’s Handbook for how domain spells work.

Order Domain Spells

Cleric Level Spells
1st Fire Bolt, Create Bonfire, Faerie Fire
3rd Fireball, Flame Blade
5th Flame Strike, Wall of Fire, Fire Shield
7th Fire Storm, Sunbeam
9th Sunburst, dominate person

Bonus Proficiencies

1st-level Lava Domain feature

You gain proficiency with heavy armor. You also gain proficiency in any saving throw of your choice

Heatproof skin

You have adapted a resistance to fire damage from being exposed to Fire for to long

Embodiment of Chaos

6th-level Lava Domain Feature 

You have become remarkably adept at channeling magical energy to cause severe damage

If you cast a spell of the evocation school using a spell slot of 1st level or higher, you can change the spell’s casting time to 1 bonus action for this casting, provided the spell’s casting time is normally 1 action.

You can use this feature a number of times equal to your Wisdom modifier (minimum of once), and you regain all expended uses of it when you finish a long rest.

Incendiary Weapons

8th-level Lava Domain feature

You gain the ability to infuse your weapon strikes with heat from your Lava. Once on each of your turns when you hit a creature with a weapon attack, you can cause the attack to deal an extra 1d8 fire damage to the target. When you reach 14th level, the extra damage increases to 2d8

And when you reach level 17 the damage increases to 1d20

Magma's Curse

17th-level Order Domain feature

Enemies you designate for destruction wilt under the combined efforts of you and your allies. If you deal your Incendiary Weapons damage to a creature on your turn, you can curse that creature until the start of your next turn. The next time one of your allies hits the cursed creature with an attack, the target also takes 2d8 fire damage, and the curse ends. You can curse a creature in this way only once per turn.