Treeheart was founded by Tierra Treeheart, an orphan who married Xil Wrenlow while they were young. They wed without the knowledge or permission of his powerful relatives. Xil joined her family by marriage, although he remained known by the Wrenlow name. They had no children.
Tierra died while serving with the Scouts. Xil suspected that the Wrenlows had arranged her death, but their involvement was never established. Magically bound to his family’s service, he remained subject to the obligations from which the marriage had offered no escape.
The dryad Blanca held something like a child’s place in their lives. Her companionship concealed another purpose: she was using Xil to find new forests for her own family.
During A Gathering Storm, Moirin deceived Xil about the Shadowborn Prophecy and led him to kill Zibrust. Zibrust’s twin Wretch was the true Shadowborn, and killed Xil with fire magic. His body was left in the shadow of Stubborn Rock. Xil was Treeheart’s last member; the family ended with his death.