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But in last life, the duke didn't kill Luca which made him become the successor and was able to use the wishing cup. Isn't that means the duke's fear isn't about the wishing cup will be used? Maybe it is more like to prevent the wrongness become the reality because of the wishing cup. The duke either put his trust on Luca ( so he didn't kill him) or he just decided to fuck it all off and let everything happen, happened.