An old Wizard employes your adventurers to enter his family crypt and fetch a Jar. He would do it himself except the magical wards are designed to prevent the use of wizard magic, and the mechanical traps are dangerous to anyone not in armour.
Gastak Firestoker: Neutral Magicuser level 7; 8hp; S5, I18, W13, D9, C4, Ch14; spells: 1st-2x detect magic, 2nd- levitate, 3rd-fireball, 4th-charm monster; magic items: dagger+2, scroll-treasure map. Gastak won the title to the crypt but isnt willing to risk the dungeon himself. he isnt lying about the magic wards and traps.
The Crypt of the Mundus Family
The Mundus Family lived in these parts about a century ago and they were wealthy. They each died from some incident or other and the family died out. It clearly says the family name 'MUNDUS' on the crypt entrance (and The players might ask Gastak why his name isnt Mundus).
The crypt is a slow spiral down a staircase into a beehive dome crypt with about fifty shelf crypts with old skeletons resting on them. Atop a stone platform at the centre is a large old Earthenware Jar.
The Mundus family were not so much a family as a religious cult. Entry into the crypt doesnt trigger any traps, but once the Jar of Hearts is removed, the traps arm, and 10 Skeleton Guardians rouse each turn to dispose of those violating the crypt.
Guardians: 50 skeletons armed with bone clubs (2d6).
Crypt Treasure Type: B (not including the Jar of Hearts).
Traps: Drops the PC through the stairs into a 10' shaft (1d6 damage).
The Jar of Hearts
When an Individual's Heart is placed in the Jar they become an undead Skeleton. Currently the jar has ten hearts (those of the skeleton guardians). The skeleton guardian will guard the Jar until destroyed or the heart tipped from the Jar.