Notes from author
A combination of my group support build and moonlit maiden build. Not so strongly on the "group support".
This build has tons of different attacks to get rid of enemies, you can switch out one for a heal if your prefer.
Use Hidden Body so you can stalk around in the back and not be the center of attention.
Use Alluring Skulls to gather a group of enemies and use Moonlight Greatswords R2 to dispose of them all quickly.
Feel free to have a Crystal Ring Shield to switch your Sanctus from, just to have another attack to use, but when you start taking damage switch back to the Sanctus so you can regen some health.
Also, make sure to carry a Divine Avelyn +5 with Lightning Bolts on hand to switch to when you feel like. I put extra into Endurance to be able to switch the Crystal Catalyst to it.
That's really all there is about tactics to know about this build.