480 Vol7 Ch18: The completed bridge

"Before his death, lord Dolan regained his senses and felt remorseful for his mistakes, so he had given his remnant soul to you" Aureum explained.

Perhaps it was out of his guilt towards Parry's death but Catho easily handed over the method to extract and implant a secondary soul. Dolan had also requested Aureum not to tell Parry about who he was, not wanting the boy to know of his father's evil deeds.

After that, while Dolan's remnant soul hadn't completely burnt away, it was extracted and implanted.

In this way, Parry and Ramillies both became Ghostmen.

Perhaps because the implanted secondary soul both belonged to their family members who truly wanted to help them survive, there were practically no side effects to the implant, allowing them to quickly sense their respective awakened abilities.