Even though they are trying with rewards you will not be able to advance or be successful in the Legend World Boss. CTP's will not upgrade to "Brilliant", and the only recent time receiving a CTP in the Giant Boss Raid was 12/24/21 after a post. There is no fair gameplay or rewards and everything is based on "how much money you spend", you will waste your materials because you will never be able to upgrade them to conquer more advance stages. I'm still waiting to aquire a 5-6* artifact.