The ancient Calistrian temple of Imvrildara, located in the southern Fierani Forest of Kyonin, is the base for the goddess's most militant sect of worshipers: the Imvrildarai, defenders of the forest against Treerazer and its demonic armies.
The temple's history dates back nearly 10 millennia, to its completion in -5570 AR at the request of a forgotten sovereign. It was located at that time near the center of a much more expansive Kyonin than today's nation. The fortress-like stone temple is named for a Calistrian priest who authored and illustrated a record of the Savored Sting's role in the battle against Rovagug.
Imvrildara's modern reputation as a base against Treerazer, however, began in 2497 AR when it became a home for refugees from the demon's destructive rampage. Among those refugees was the farmer Alendeil, who became a priest of Calistria, then later single-handedly defended the temple against Treerazer's nalfeshnee Echataxun through a miraculous act of Calistria that sealed the demon in stone.
Nearly two centuries later, in 2632 AR, the Imvrildarai led Golarion's elves returning from Castrovel against Treerazer with such success that the order relented and retreated to academic pursuits.
While showing its thousands of years of age through overgrowth and use, Imvrildara's persistence is also a testament of its durability. Trees spring through its stone floors near and between its three outer towers—the towers of Revenge and Deceit, which extend four floors skyward, and the ruined Tower of Lust. The fourth and largest central structure, of which only a single domed floor extends above ground, descends into three sub-basements.
Its main iron gates stand 15 feet tall and 10 feet wide. As is common among worshipers of Calistria, the Imvrildarai's priests cultivate wasp hives, including constructed warmonger wasps, throughout the premises as part of its defense.
In addition to its living quarters, sanctuary, and other basic accommodations, the temple also includes an archive of historical records, several studies and libraries focused on combating the demonic threat, a combat training room, reliquaries, armory, Ocularum, a bone shrine of slain enemies, and a secret library of demonic stone.