So I've had this idea in my head for some time now and i was thinking of adding another line to the Avenging Angel feature (since I feel that compared to the ohers it's a little bit lacking) an I was wondering how balanced other people think this is:

During this time, you gain a number of charges of Channel Divinity: Vow of Enmity equal to your charisma modifier (a minimum of one). As an action, you can expend all these charges and Vow. Enmity against all creatures in a 5 foot radius.

I feel that it does little to alter the subclass feel and has great synergy with its other features (i.e. Relentless Avenger and Soul of Vengeance) , but maybe a bit too much? What do you guys think?