A Gulthias tree was a plant infused with supernatural evil, capable of spreading corruption to nearby plant life and generating malevolent creatures known as Blights. A Gulthias tree could originate wherever a plant was contaminated by an evil force or sentience, resulting in Desecrated land. The tree and its associated blights could turn a lush forest into a toxic, bramble-filled wasteland, growing with supernatural speed to overwhelm nearby roadways and settlements.
These trees could be destroyed, but without having their entire stump uprooted, they would be able to slowly regenerate. This could be overcome either by completely destroying the root of the tree, or if the area was Consecrated; consecration would destroy the tree's ability to interact with the soil, causing it to wither and die over a matter of weeks. If a Gulthias tree died, it released an inhuman scream that killed all blights that could hear it.