Divine Epithet

You have studied deeply your deities lore and domain, and have learnt that your current way of worship to them, while correct, is not all that your god is. For example, a deity of nature also may have domain over the grave, or a god of arcana also having power over knowledge as a whole.

Choose a divine domain that isn’t your current one, that fits thematically with your current deity. Whenever you use your Channel Divinity, you can use that domain’s second level Channel Divinity option. 

In addition, choose a 1st level spell of that domain’s list of Domain Spells. You can cast it once per long rest without expending a spell slot.