Item from From Blood and Ash by Jennifer L. Armentrout
An ancient ritual binding a wolven to two Atlantians simultaneously — performed by Poppy, Casteel, and Kieran in an act that rewrote the rules.
The Joining is a ritual so old and so rarely performed that most Atlantians consider it forbidden or forgotten. It binds a wolven to two Atlantians at once, creating a three-way soul bond of shared strength, sensation, and loyalty. When Poppy, Casteel, and Kieran underwent the Joining, it was partly necessity — Poppy's awakening power needed anchoring — and partly an acknowledgment of the bond that already existed between the three of them. The ritual is intimate, powerful, and irreversible.