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.

In, most of the Ring of Brass went to the Tree of Names to investigate it further. When they did so, they found that objects sent across the planes were caught in its branches. Patia Por'co attempted to learn more about it, and in doing so learned its history: the druids of the Gau Drashari created the tree to sit in Avalir when it was first lifted, and as the city traveled along the leylines of Exandria, the tree created a protection spell against extraplanar threats as it dropped blossoms. It seemed to have additional protective properties against some extraplanar entities, as fiends on the Material Plane would often vomit blood and blossoms.

Laerryn Coramar-Seelie cast Blight on the tree, breaking it in two, after seeing Evandrin's face in the branches. Vespin Chloras then emerged.

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" and is derived from the Ancient Greek "κύλιξ" (kylix). So, together "Arboreal Calix" indicates a tree-like chalice, or a chalice for a tree. Additionally, in botany, the calyx is a cup-shaped group of leaf-like sepals at the base of a flower. This is derived from the Latin "calyx", which in turn is derived from the Ancient Greek "κάλυξ" (kálux); "calix" and "calyx" are distinct words in Latin, though they are used interchangeably in botanical Latin.