I didn't see this anywhere but these are some of the drops.
Bia : Albine Bane
Sava (vampire): Jovian feet and Nodens Gorget
Tenodera: Triton feet
Penna Cotta: Grove hands and Balarama Grip
Perithoos: Cyllen feet
Emputa: Foritfied ring
Wasserspeier: Quarrel mantle