Un'Coeden

Un'Coeden is an ancient fey entity based in Caerland, also known as "The Green Man". Un'Coeden means "One Tree" in the Caerth language. Though it is a fey entity dedicated to the preservation of life, its methods are considered horrible by most humans and elves. Un'Coeden assimilates all other beings into its own hive mind, and can spread its influence incredibly far.
=== Creation ===
Un'Coeden was created by the Elves to fight back against dark incursions into Caerland by demons and Fomorraigh. Unfortunately the creature quickly grew out of control, and started assimilating all nearby creatures and plants into itself, the entire nearby forest became under the control of Un'Coeden. The Green Man believed that the best way to ensure purity of the forest, was to take it over.
The Elves who created Un'Coeden quickly set about aiming to un-create it, however it proved far to strong to defeat, and could always spread to other parts of the forest to escape. Instead, they sealed the entity at Carchar Barrow using a powerful ritual, which combined the crafts of men with the magic of elves.
Locked away, and hidden away, Un'Coeden passed into myth after the centuries.
=== The Breaking of the Seal ===
In 20.88, Llyn'Hedfan, the Dragonfly Queen of the Sapphire Lake, visited Carchar Barrow and broke some of the seals keeping the Green Man locked away. She needed humans to finish breaking the seal. When Aidan Branwen and a number of other druids from the Grand Academy visited Caerland, she conspired with another elf, Toredig, to manipulate the druids into freeing Un'Coeden.
Aidan Branwen and Morgan Asalaine managed to break the Green Man's seal, and only realised that they had done something terrible after finding the dead bodies of druids that the Green Man had slain, in its efforts to reclaim the forest. With the aid of their elven mother Aderyn, and a number of friendly trolls, they managed to defeat Toredig, and imprison Un'Coeden once more.