I'll give a bit of a spoiler to explain that:
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Claude's black magic was used to forget Diana. The magic takes 7 years to complete so when Claude first saw Athy (at 9 years old) he had already forgotten Diana and thought Athy was his child from a random dancer/concubine. On top of that Jennette has a magic to make everyone like her so she was immediately liked by Claude and when Jennette was poisoned he got really mad and ended up killing Athy because she was his child from a random person to him.
ooh I see now. so that was why he was saying that he was close to forgetting diana in the early chapters when athy was still a little kid. I recalled him saying that only a year left and he could have forgotten about Diana. Was the black magic also the reason why he got his amnesia? Or was it entirely Anastacius' doing?
claude was such an asshole in lp, imagine meeting your daughter at age 9 but repeatedly paying her no attention but when another girl is presented as his daughter at age 14, he what?? hE ACCEPTS HER WITH HIS WHOLE CHEST TF then he kills his daughter who was physically reminiscent of his true love w/o a blink of an eye and when it was revealed that jeanette was not his daughter after all, but his brother's who betrayed and tried to kill him when he was younger, it was... okay?? bullshit. and he didn't even feel the slightest remorse even tho he killed his true daughter. what bull.