Ensuing the defeat of the pillar men Caesar, incapacitated from the battle, spent quite a duration of time healing on air supplena island. during those months he continued to learn from his master and after making as close to a full recovery as possible, makes the decision to continue seeking purpose outside of his revenge.
it's sometime afterwards that he hears of the mask's influence and finds a new purpose in pursuit of information and eventual eradication of their presence; similar to his grandfather. he uses hamon in a similar manner to Lisa lisa and slows his own ageing process, having also further developed his own hamon capabilities.
he travels to Egypt upon the whim of a zephyr, tales of the mask's influence and what lingers in its wake are potentially catastrophic. He does not speak of his travels to Joseph, with how precarious the venture promises to be and the man he'd come to call a close comrade a father now, he cannot bring himself to endanger him for such selfish reasons, thus going in alone.
During his time in egypt, he is lead to an elusive man, at the time not being completely aware of his identity. Erina and Joseph had spoken to him about Jonathan Joestar and his conflict against DIO but at that time he did not know for certain that the man who was spoken of was that man from the Joestar's past.
He encounters DIO sometime later and upon the revelation of his usage of hamon and his connection with Joseph Joestar he implants a flesh bud in Caesar, enslaving him to his whim thus instating a new enemy for the crusaders.
