((Well, in the interest of plot and time hack, I just posted the guys armaments and equipment, not supplies. I could give you a list of all the food and items they are carrying, but that would take a request on your part to see their inventories, yadda yadda yadda. Let's just assume they won't need food/ normal human requirements unless the situation warrants it.))
> PRIMARY ACTION(S)
INQUIRE COMPANIONS NOURISHMENT LEVEL
SEARCH FOR TEMPLE [9+2] (well rested)
You ask your companions if they are hungry or thirsty at all. They respond that they had gathered their own supplies, and aren't lacking for food and water, or any other amenities for that matter. With that question out of the way, you and your newfound friends head off in search of a temple, after you explain your theory of "Mummification gone wrong" and "Osiris is angry with us". They seem dubious at best, but agree amongst themselves that following through couldn't hurt. Besides, they could become heroes.
After heading through some backstreets, and altogether managing to evade the undead, you get a glimpse of what you have been looking for -
The Crypt of Anahotet.
A great Pharaoh that had passed many years before, his tomb was built out of huge granite blocks, hauled from quarries in the stone fields in the north. The building, from the outside, looks to be a giant rectangular monolith. It is roughly 500 meters long and 200 wide, with a great, statue flanked stone entrance way. There is a second story of roughly half the size, and a third of a quarter the size, where his final resting place is. There is a single problem, though - there is roughly half the city on the front stoops of the temple. And you don't think they are of the living kind.