He was coming.
They both felt it. With him coming, they were safe. They didn't know who he was, but they felt it instinctively. A force that came from within them welled up, directing them as they both used the power surrounding them to cut their palms before placing them back on top of each other's.
"I, Soteria, solemnly vow by our mother to be bound…"
"I, Aletheia, solemnly vow by our mother to be bound..."
"Life into life, death into death, bound by ties of blood and flesh, in this life and those to come, to never be apart from you."