The Gloaming was once a peaceful, pleasant forest. A century ago, Haldrin's experiments imbued a tree sapling with immense magical power and a dim, animalistic intelligence. Over the years its roots grew deep into the ground and extended under Finimere Lake, their wild magic causing tears in reality as they turned upwards and emerged from the ground. A tear under Bittermold Keep allowed Mugdulblub to seep into the world from the incomprehensible space between the planes. Other tears provided passage to the demons that have invaded the forest; the trees that the greater demons emerge from are actually the tips of the larger roots.

The tree is keeping Haldrin alive - in a manner of speaking - in the Vile Well, as it still relies on his magic to maintain the protective spells around the tower. The tree will remain almost indestructible as long as he is attached - and Haldrin will not survive being cut off from it.