http://www.minecraftforum.net/topic/222708-scorched-sands-hardcore-survival-rppvp/
The concept is the is a high and almighty douche bag who runs and owns everything from the money to the food, there is no place for food to grow and only the guy who calls himself tyrant can grow food from seeds, There are no trees only desert and you have to survive on your own, don't eat for a period of time and you will die. The only way to acquire even the most basic of needs is to hunt the cacti and breaking them for a small chance to get wood.
There is a lot to explain but just read what the thread said and it's a brilliant thing that was sadly put to rest. The rp focus is fairly moderate but it makes up for that with the other perks that it brought along with it.