Tomb of 10000 Kings

In The Blue Desert to the East of the Aasimar city there is a giant pyramid that recently appeared. The area surrounding the pyramid is dotted with empty tombs. These tombs feature egyptian style art but have nothing of value in them. The new Rebel Hideout is in these abandoned tombs. The pyramid has an opening on one side. Entering in the opening leads to a room with a message written in the Aasimar language that says "Tomb of 10000 Kings", there is a door leading out of this room.

Every time a party enters the pyramid the interior layout is randomly generated so as to be different each time. All the floors are covered in Blue Sand so be sure to keep track of how much players use the sand.

The pyramid has 1d4+1 rooms. The first 1d4 rooms are populated from the table below.

The final room has no blue sand in it and is the room of the ancient Aasimar king. The kings are all powerful wizards whose mummified corpses have been enchanted to get up and attack any who enter the room. Use the Archmage stat block on page 342 of the monster manual with the following modifications.

The Aasimar mummy kings take double damage from fire.

Roll a d6 to determine one additional feature from the table below.

The party is free to leave the way they came but if they make it to the end and defeat the Aasimar mummy king each party member gets 1d100 worth of treasure as well as a magic item determined by rolling on Magic Item Table F on page 146 of the DMG.