Arcan'dor
The Arcan'dor is a magical tree found in the ruins of Shal'Aran in Suramar.
This plant was developed by a secretive order of kal'dorei that wished to create a plant that perfectly fused life and arcane forces. They believed that one day the tree would be necessary to save the city of Suramar from certain doom.
Rather then nutrients, the tree requires an abundance of ley line energy.
There were three seeds created. The first, when planted, didn't have access to the ley energy needed and thusly pulled what it needed from the people of the commune and killing all of them. The second seed was gifted to a group of exiles from Suramar in an attempt to spare them from their fate. Something went wrong with this tree, causing it to explode and corrupt the exiles- who were saved due to divine intervention of Elune. The third has been planted in Shal'Aran by the Nightfallen Rebellion, in hopes that the past two failures can be learned from and that it truly is the solution to saving their people.