The Covenant of this build doesn't matter. I went with Darkmoon simply because I like it. Overall this is an excellent pvp/pve build. You have enough attunement slots to get all sorcery on anything you want without having to worry too much about getting a magical weapon (though I would strongly recommend attempting to get one asap.) at the beginning stages of the game. Once the Moonlight Blade is acquired the game becomes easy cake. Perfect blade if you want to get close plus excellent power attacks to help knock down any foe you'd like. The Crystal Ring Shield doesn't allow for parrying but does give you a power attack to keep people at a distance AND provides the HIGHEST magical defense in the game without having to beef up strength of dexterity. Have fun and enjoy.
**If you are confused about the name just Wikipedia it. I was trying to go for a powerful Sage.