If you sleep in the Cursed sarcophagus a few times (quite a dew) you will be cursed. That's what I did, but it didn't work when I went back to finish the Get Scorched, Soaked and Cursed adventure. I can't find the Cursed sarcophagus in Al Simhara and I can't build one there. I'm stuck...
There are 2 type of Sarcophagus in BuyDebug. The first one is blessed and the one next to it is cursed.
FYI, the plural form of Sarcophagus is Sarcophagi. But the spelling of its single form is difficult enough for some people, so I avoid using it to avoid confusing people avoiding difficult words used to avoid some words the developers avoid using. I think I've been cursed.
All my characters are either good fighters or extremely lucky. They never get cursed. I can't do this quest, but it does not worry me as this is not one of the major Egypt quests. There are 2-3 big ones that have to do with MorcuCorp and involve a series of Tomb locations. The problem I encountered was it ended between the miniquests - I did not get the trigger for the next quest stage.