mpbt 11 binding

"It's almost time for comrade Hideyoshi and I to set sail." She said, turning to her companions, "I believe now would be a good time to tell you about the source of Salvae's strength – the Ritual of Soul Gem Binding.

She transformed her ring into a bright maroon Soul Gem that shimmered in the morning light. Audrey, Ligaya and Michi listened intently.

"Whenever a Puella Magi of Salvae is chosen for a promotion, she will take part in the Ritual of Soul Gem Binding. There, she reaffirms her allegiance to her superior and her superior vows to protect her new sister-in-magic. It's why Zealots are fiercely loyal to their Carissimas and vice versa."

"The same is true for Carissimas and the Magni Domina, then." Audrey hummed. Serafina nodded, then scratched her head and laughed dryly.

"Though, I may be a little bit of an exception in this case."

The Ukrainian girl cleared her throat then continued to speak.

"Anyways… after the exchange of oaths, the junior then offers her Soul Gem to her superior, and their gems are bound together by magic."

"What sort of magic?" Michi suddenly asked.

"Frankly, I don't have the faintest clue." Serafina shrugged, "All I know is that the binding is a sign of loyalty, and that the bond created there strengthens the gems of both the girls."

(Magia, Pacem, Bellum Terarrum, Chapter 11)