After completing the trap corridor where you had to race to the slowly closing door, you will battle some Sand Monsters in the courtyard. After this has been successfully done, climb up the courtyard. When you are in the section where you have to climb up the ladder which appears above the spikes, continue until you find a Sand Cloud. Near the sand cloud is a hole in the wall. Climb up the rubble and run among the wall to grab on the ledge. Go through the hole to find yourself in a mystery area. Keep walking on the bridges until you reach a fountain. Drinking from this fountain will raise your life bar.