I wrote my first ever attempt at a homebrew subclass, would like some feedback. The flavor is a cleric that hunts down other clerics, so it uses Silence a lot. I tried making it a bit on the stronger side because it's not meant as a PC subclass, its for a faction in my campaing.

>Cleric: Vengeance Domain
>Level 1: Martial weapon proeficiency. When using finesse weapons, use your wisdom modifier for attacks.
>Domain spells: Level 1: Disguise Self, Cause Fear, Silence - Level 5: Counterspell, Fear - Level 7: Greater Invisibility, Phantasmal Killer - Level 9: Aura of Silence (pic related), Passwall
>Level 2: Silencing Strike - When you hit a creature with a melee attack, you can use your channel divinity to perform Silencing Strike. If you do, the target must perform a Constitution save or become silenced for two turns. Costs Channel Divinity charge
>Level 6: You have advantage on melee attacks against silenced targets.
>Level 8: Divine Strike: Vengeful - 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 Psychic damage to the target. When you reach 14th level, the extra damage increases to 2d8.
>Level 17: Creatures silenced by effects you caused take 2d10 psychic damage at he beginning of each of their turns.