Merely passionate whispers are required for Perpetua to commit her body and soul to whoever summoned her. However, her power is entirely dependent upon the soul infused within each syllable offered. Therefore, the summoner must be prepared to lose their life from the very moment they perform the ceremony. Whenever she finds their words lacking in sufficient zeal, she will consume their soul and return from whence she came.
Perpetua is a Spanish, Italian and Portuguese (Perpétua) feminine name, derived from Latin perpetuus meaning "forever, perpetual, everlasting, continuous". This was the name of a 3rd-century saint martyred with another woman named Felicity.