My sim with Level 5 Athletic and Level 3 Martial Arts who is trying to get cursed, just beat up both Mummys in the Rashid Basement (Trapped At Home). He hasn't been practising the Martial Arts until after he finishes this Adventure (Get Scorched, Soaked & Cursed). The Red and Blue Priests beat him into unconsciousness, but didn't curse him. It used to be that the Red Priest always seemed to curse my Sim. He hasn't done so for a while. Now these two both lost. How long is it going to take for him to get cursed. Well on to the Tomb of the Rock.
Update. The Tomb of the Rock didn't get him cursed, but he had a wish to finish a tomb, so he went down the back stairs to complete The Tomb of the Burning Sands. Have you ever noticed that when you satisfy a wish, it, or a sequel shows up right away. As soon as he went downstairs into the Tomb of the Rock, the same wish came up. The Rock doesn't take very long, so it was satisfied quickly, but unsuccessfully. I remembered I also need a photo of a Mummy, but I couldn't get a shot of a Mummy, because the Sarcophagus was behind him. A Sarcophagus photo with a Mummy in front of it doesn't count as "Proof Of Mummification."
I was about to give up but the third Mummy at the Sphinx got the job done. I still don't know how he beat up the other two. My Sims have had their butts kicked when they had both skills maxed out.