Cluster jewels are new items that can only be obtained in the POE's Delirium Challenge League. Their main function is to further expand the player's passive skill tree. All experienced POE players know that the passive skill tree is the core system of the game. You can add more cluster jewels to get more reinforcement effects from passive skills.
It is worth noting that you need to create new characters to participate in the Challenge League, which means that you need to take risks in the state of nothing. In this case, encountering the enhanced monster of the Mirror of Delirium, you will usually face the threat of death. Fortunately, MMOAH has started to provide players with the POE Currency and POE Items of the Delirium Challenge League.
MMOAH has always had a high reputation among the POE players, they provide cheap and safe POE Currency, and 24/7 online customer service to answer questions for users. If you want to defeat the horrible bosses in POE as soon as possible, you can Buy POE Currency from the official website of MMOAH.