Chance of tombs under desert wells.

A desert well could have a good chance of having a tomb beneath it. These tombs could vary between being fairly minimal with a block built sarcophagus and a chest to being grander and decorated with the odd block of emerald or gold statue. This could tie in with the future archaeological stuff, perhaps the tombs could be dotted with pots and relics n such. However the more elaborate the tomb the more likely you are to receive a random curse or debuff from entering it, a price to pay for the artifacts. Loot could range from a tameable mummified cat or dog pet to gems and enchanted armour pieces. The more valuable being confined to the grandest of tombs.