Tree of Names

The Tree of Names is a tree sacred to the Gau Drashari and important to the Pact of Crown and Throne to which Avalir is beholden. Since the Replenishment following the ascension of the Raven Queen, 119 years prior to the events of Exandria Unlimited: Calamity, it has been protected by a piece of arcane equipment known as the Arboreal Calix.

History
The Tree of Names is in Avalir and is indicated to be related to the Ritual of Seeding. It is considered a key artifact of Avalir, and the mere mention of it is a sign to the Eyes of Avalir to track the individual doing so to ensure the tree's protection.

When Cerrit Agrupnin told the Ring of Brass about this, Zerxus mentioned that there had been a tree in his dream, held in the palm of a Betrayer God, and that the blossoms of the tree fell on Evandrin. He felt this related to Evandrin's disappearance.

Arboreal Calix
The Arboreal Calix was installed over the Tree of Names to protect it, shortly after the Raven Queen ascended, by the druids of Toramunda. Since then, "Arboreal Calix" has supplanted the Tree of Names as the term people use.

While Laerryn is unaware of what the machinery does, she is aware that over half of the raw magic energy required as a tithe per the Drashari Pact goes solely to the Arboreal Calix. After Laerryn successfully transported the model of Avalir to another plane, she found that the Arboreal Calix drew noticeably more magic.

Trivia

 * In Latin, "Calix" means "Chalice". So, together "Arboreal Calix" indicates a tree-like chalice, or a chalice for a tree.
 * In botany, the calyx is a cup-shaped group of leaf-like sepals at the base of a flower. It protects the growing bud and typically remains in place after it blooms, and may even remain on the resulting fruit (e.g. strawberries and eggplants).