From D&D Wiki
The Infernal Domain was inspired by a particularly charming devil named Devin. In an attempt to create a subclass suited for worshippers of devils that isn't entirely based on lore, but more on fire and brimstone. As a mix of tank and spellcaster, it's probably broken in it's current state.
- Infernal Domain Spells
Cleric Spells: 1st - Burning Hands, Detect Magic 3rd - Hold Person, Scorching Ray 5th - Fireball, Slow 7th - Death Ward, Compulsion 9th - Teleportation Circle, Scrying
- Bonus Proficiencies
When you choose this domain at 1st level, you gain proficiency with heavy armor. You also gain proficiency in the Intimidation or Persuasion skill (your choice).
- Arcane Initiate
When you choose this domain at 1st level, you gain proficiency in the Arcana skill, and you gain two cantrips of your choice from the wizard spell list. For you, these cantrips count as cleric cantrips.
- Channel Divinity - Infernal Wrath
Starting at 2nd level, you can use your Channel Divinity to wield infernal power with unchecked ferocity.
When you roll fire or necrotic damage, you can use your Channel Divinity to deal maximum damage, instead of rolling.
- Inescapable Destruction
Starting at 6th level, your ability to channel negative energy becomes more potent. Necrotic damage dealt by your cleric spells and Channel Divinity options ignores resistance to necrotic damage.
- Potent Spellcasting
Starting at 8th level, you add your Wisdom modifier to the damage you deal with any cleric cantrip.
- Arcane Mastery
At 17th level, you choose four spells from the wizard spell list, one from each of the following levels: 6th, 7th, 8th, and 9th. You add them to your list of domain spells. Like your other domain spells, they are always prepared and count as cleric spells for you.