Since the Era of Celestials is just a mmo role playing game, exploits really are a thing that enables you to gain a huge advantage once in a while. An exploit is essentially a bug in the game that enables you to get something easier than usual. Dupe exploits permit you to duplicate items, then sell them for diamonds or use them for crafting. XP exploits permit you to farm XP extremely quickly. Bugged quests and rewards may also permit you to get unlimited rubies, Gold, items ect. – However, such bugs are often patched and gone quite quickly after being discovered.