Alluveterre was one of the Black Swan's Secret Hideouts. The name means "the sands of dawn," and was gifted to the Black Swan by King Enki. The Black Swan views it as a testimony of the planet's ability to recreate itself; while directly above it is human pollution and destruction, in the safety of Alluveterre, there is life.
The only entry point to Alluveterre is a secret passageway, the location of which is known only by Sophie, Fitz, Biana, Dex, Keefe, Linh, Tam, Della, and a few other Black Swan Operatives. It has been compromised, due to Keefe joining the Neverseen, and thus can no longer be used.
It is located near Thailand, according to the map in Unlocked. It is, however, far away from the human world.
There is a common area between the two treehouses, with an arched bridge and a black gazebo. This bridge connects two trees (each located on a different side of the river), creating a staircase going up to the treehouses. The Eastern Treehouse is for girls, the Western Treehouse is for boys. The girls' treehouse has rugs made of fall leaves, flowering branches with berries all over the walls and ceiling, sculpted furniture that looks like shrubs, and a waterfall in the center. The common room in the boys' treehouse is decorated like a campsite, complete with indoor trees, a ceiling glittering with stars, and an enormous fire pit in the center with flames that burn in every color of the rainbow along with a few boulder shaped bean bags.
Once a hideout for the Black Swan (and now abandoned because the Neverseen have a crystal that could give them access), Alluveterre is an enormous underground cavern that contains a lush forest, as well as a subterranean river. Two of the largest trees have been crowned with clever tree houses connected by an arched bridge, and winding wooden staircases wrap around the trunks to provide access. During Sophie's time residing in Alluveterre, she and her friends were separated in to groups, (Sophie, Biana, and Della in one tree house, and Keefe, Dex, and Fitz in the other.) When Tam and Linh lived there, they claimed a treehouse for themselves. The hideout was given to the Black Swan by the dwarven king - which is why the name comes from the dwarven language (meaning "the sands of dawn") - and the dwarves view Alluveterre as a testimony of our planet's power to recreate itself, since the land is above the desolation from human pollution and destruction, while below, a crack filtered the light in and allowed nature to thrive in peace.
While Sophie and her friends were banished for treasonous acts, they were forced to live in Alluveterre. They stayed in Alluveterre until The Council revoked their banishment sentence. While living there, Sophie and her friends frequently communicated with Mr. Forkle and the other members of The Collective. Tam and Linh lived in Alluveterre for a while, but were forced to live elsewhere after Alluveterre was compromised by Keefe.
- Sophie Foster (During Neverseen)
- Biana Vacker (During Neverseen)
- Fitz Vacker (During Neverseen)
- Keefe Sencen (During Neverseen)
- Dex Dizznee (During Neverseen)
- Della Vacker (During Neverseen)
- Calla (During Neverseen)
- Linh Song (During Neverseen and Lodestar, forced to live elsewhere after Alluveterre was compromised)
- Tam Song (During Neverseen and Lodestar, forced to live elsewhere after Alluveterre was compromised)
- Wylie Endal (During Lodestar, after his kidnapping)
“The dwarves view this place as a testimony of our planet's power to recreate itself. Above us is a barren wasteland of human pollution and destruction. But look what has surged to life in the safety below, thanks to a little light and a little peace.”