Obtain the Moon Shield from coordinate (3, 1). To reach it, you must invade the moon tower, found in the northwest corner of the fourth floor.
You can quickly farm gold at the south-west corner of this floor. Grab the treasure from the five chests, and head down two floors to get the chests to reappear.
Obtain the ring from coordinate (26, 25). To reach it, you must invade the sun tower, found in the southeast corner of the second floor.
When you possess the Moon Shield, visit coordinate (16, 24). After you do, you will receive important information the next time you visit the Temple in the Town of Dorl.