The Desert Officer is a level 70 enemy in Desert that spawn in a small island behind the Pyramid. Desert Officers are the 2nd enemy at the Desert after the Desert Bandits. They have around 1000 health and deal 47.7 damage per hit. However, they also use swords, meaning on the third hit, they will deal 49.9 damage. Chop would be a useful fruit on this occasion, since you will be completely immune. Logia will work as well.
The quest gives 4,500 Beli And 50,000 EXP