Quartz
Hero
I really don't like the way D&D does deities. Historically, priests worshipped pantheons, not individual deities. Fortunately it's easy to retrofit that to D&D. A priest might serve the Olympian pantheon and if her particular interest were the sea she might especially pray to Poseidon and be granted the Water domain. Later in life she might especially pray to Hestia and get the Home & Hearth domain instead.