Question: dark souls 3 how to join the mound makers?
Answer: You must complete a small portion of the Sirris of the Sunless Realms. Once far enough, her summon sign will appear just outside the doorway where you fought the Curse Rotted Greatwood. Join her world and kill Holy Knight Hodrick (her grandfather), and after, you will get the Mound Makers token, allowing you to join.