I think there should be a sand man mob, who resurrects you in his house if you die in a sand biome, he should be a giant hat with arms and legs and hold a big bag, but if you attack him he will try to catch you and put you in his basement, which could have a bunch of traps.

I would like to do something like this with traps and other stuff to escape like the jail.. I also want to add more structures in future releases