I would like to suggest a significant change to the graveyard and how "scoring" is calculated:
I think the players who have successfully completed the Catacombs should receive Mausoleums in a separate graveyard space. The deeper the Catacomb, the bigger the Mausoleum they receive.
Meanwhile, players whose dropped Items were used by the other players who complete the Catacombs should receive score points, which result in their graves receiving flowers. Players who have flowers receive priority placement in the graveyard (either closer to the entrance, or up the two middle columns of the graveyard).
This will further incentivise players to drop gear instead of leaving vengeful ghosts, and give those players a sense of accomplishment, even when they don't manage to complete a Catacomb personally.