What to do after beating FINAL DLC Boss Gael

[Mice]

Yeah so ♥♥♥♥♥ done, I went to that one girl painting and gave her the dark blood. Is that it?

[Krustenkäse]

You can go to the Bonfire before the Gael fight. Go out of the Room in Gaels Direction and turn right into the ruins and you'll be invaded.

The Elevator thats next to the "Gwynn and the Pigmy" Statue has a Secret Exit in the Middle. A Hole in the Wall. Go there. Turn right to drop onto the Statue and get the Chlorantie Ring +3.
Go up again. Turn Left and hit the Wall next to the 2nd Black Knight. Follow the Path and go down the Ladder. Drop down behind the Altar and you'll be greated with a ♥♥♥♥♥♥♥ Hard Boss Fight that unlocks the new Covenant.

Have Fun trying !