Its in-game description reads "Made in the shape of the ancient royal house' crest." The Five-Star Armlet is one of the two ultimates armbands avialable for Monica, the other being the Love, so it has very high stats and it is also a armlet that comes with balanced stats : it doesn't have any elementals stats at 0, so it can defeat any enemy very easily. And as you don't have to worry about the speed factor with the armbands, it can handle a large amount of enemies with no trouble. The Five-Star Armlet a high-tier weapon (Tier 9) : it'll gain 6 Synthesis Points (SP) per level-up.