Inquisition Domain.

The Inquisition domain reflects the order of the multiverse and the rejection of tainted magic—at least so far as certain celestial powers see it. Only the divine casters are pure and fit for use. Since arcane magic is strong enough to challenge the gods, divine beings of this domain demand magic-using mortals are kept in check. Most zealots root out all arcanists, while some strike fragile truces when complete removal isn't feasible.

Level 1 Features:

Inquisition Domain Spells.

Each domain has a list of spells—its domain spells—that you gain at the cleric levels noted in the domain description. Once you gain a domain spell, you always have it prepared, and it doesn't count against the number of spells you can prepare each day.
If you have a domain spell that doesn't appear on the cleric spell list, the spell is nonetheless a cleric spell for you.

Bonus Proficiencies.

At 1st level, you gain proficiency with martial weapons and heavy armor.

Witch Hunter's Strike.

At 1st level, when you hit a creature with a weapon attack, you can deal an additional 1d8 force damage. If the creature is concentrating on a spell, you deal an additional 2d8 force damage instead. If a creature fails its saving throw to maintain concentration as a result of taking damage from this feature, you gain a number of temporary hit points equal to the extra force damage dealt by this attack. You can use this feature a number of times equal to your Intelligence, Wisdom or Charisma modifier (a minimum of once), regaining all uses upon completion of a long rest.
At 14th level, this damage increases to 2d8, and 3d8 if the creature is concentrating on a spell.

Level 2 Feature:

Channel Divinity: Spell Shield.

Starting at 2nd level, you can use your Channel Divinity to bestow a temporary resilience to arcane harm.
As a bonus action, you present your holy symbol and choose a creature you can see (including yourself) within 30 feet. The chosen creature gains temporary hit points equal to 1d10 + your cleric level. While a creature has temporary hit points granted by your spell shield, it has resistance to damage from spells and advantage on saving throws against spells. The creature loses any remaining temporary hit points after 1 hour.

Level 6 Feature:

Rebuke Invoker.

Starting at 6th level, as a reaction when a creature you can see within 60 feet casts a spell, you can force the creature to make a Constitution saving throw. On a failure, the creature takes force damage equal to 1d8 per level of spell slot expended casting the spell + your Intelligence, Wisdom or Charisma modifier. Cantrips are considered first-level spells for this ability. On a successful save the creature takes half as much damage instead.
You can use this feature a number of times equal to your Intelligence, Wisdom or Charisma modifier (minimum once). You regain all uses when you finish a long rest.

Level 8 Feature:

Divine Strike.

At 8th level, you gain the ability to infuse your weapon strikes with the power of celestial order. 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 force damage to the target.

Level 17 Feature:

Supernal Safeguard.

Starting at 17th level, when you use your Spell Shield channel divinity, you can choose a number of creatures up to your Intelligence, Wisdom or Charisma modifier (minimum 2) instead of choosing only one.