You can add options to 380lvl items.
If the combination will succeed, your Level 380 item will have pink options. However, if the combination will fail, the Jewel of Harmony & Jewel of Guardian will disappear but your Level 380 item will be left unharmed!
List of Pink Options:
-Helm-
SD Recovery Rate increase +20 Defense Success Rate increase +10
-Armor-
SD Auto Recovery
Defense Success Rate increase +10
-Pants-
Defensive Skill +200
Defense Success Rate increase +10
-Gloves-
Max HP increase +200
Defense Success Rate increase +10
-Boots-
Max SD increase +700
Defense Success Rate increase +10
-Weapon-
Additional Damage +200
Attack Success Rate increase +10