Finishing up the end of a quest with my D&D group.
They have been trapped in a pseudo possessed graveyard, where a blue mist controls everything around them ala silent hill/that-one-episode-from-samurai-jack style.
They fought their way past undead and made it to a large roofed cathedral with a collossal set of doors, cracked with the mist pouring through as an entity on the other side attempts to smash through.
Heavy silver chains coat the door, and 4 large padlocks adorn it, only 1 contains sword buried in the lock as a key. Danger looms as a black dragon swoops down from a balcony and stamps infront of them, ready to battle.
They fought the dragon hard and managed to slay it, but now zombies and skeletals have started trickling in though the various entrances. Book-cases become hallways teeming with undead, Zombies crawl over balconys and drop down as the beast within attempts everything it can to destroy the intruders.
Long story short they need to find the other keys to seal away the whatever which has been leaking its necromantic influence.
1 stone sword is in their possession, 1 is already in place, 1 stone sword is buried in the dragons small horde of gold. The last one is built into a statue, but will the party figure out that the sword the statue is holding is a different stone to the swords the others are?
All while defending themselves against teeming undead.