"Calion is my son. I needed all his remains to craft the husk, so I had to use my own for the scepter. To command a spirit, use a focus made of its bones or those of its close relatives. Basic necromantic principle."
Telacar will unleash the Husk on the Vestige, having imbued it with Calion's spirit and forcing it to attack them. After destroying the scepter, they must choose whether to free Calion's spirit or to have him resurrected. If resurrected, his spirit will be imbued into his husk, and Calion will be fully in control of the body.