These catacombs are located in the northwest corner of the Starry Waste, a red region located east of the Graveyard and the Misty Forest.
After going inside, activate the place of grace and ride down the elevator. Run forward through the crypts. If there is a dead end, attack the wall, behind which there will be a room with a statue and a lever. Go back to the elevator, activate it, but don't go up.
You need to jump under the elevator! Having done this, you will find an open heavy door leading to the location boss. Pass through pools of red rot, fight two Cerberus of the Graveyard of the Tree of Erd (one uses a sword and the other uses a scepter) to receive the ashes of the Pumpkinhead Madness as a reward.
The action game also received a content update.