The Alder Door is a special portal in the bottom right corner of the Totem Wall. Seth used it when he sought Vasilis, promising to purge the evil behind it: Morisant and the Standing Dead. The four Totems that control access to the Alder Door are Anyu the Hunter, Tootega the Crone, Euralia the Dancer, and Chu the Beaver.
Source[]
- Keys to the Demon Prison (Fablehaven #5)