Blight is a 4th-level Necromancy spell. It is available to Druids, Sorcerers, Warlocks, and Wizards. It deals 8d8 Necrotic damage on a failed Con save, with half damage dealt on a success.  Plants are particularly susceptible to the effects of Blight. Plant Creatures and magical plants hit with Blight take the total 64 damage, 32 on a successful save. Nonsapient, nonmagical plants are granted no save and instead wither and die when subjected to Blight's energy.  While not directly related to the Blight species nor the Gulthias Tree, an item enchanted with a Blight spell would make for a beautiful prize at the end of a long adventure full of sapient bushes. For example, an item constructed using the wood of a Guthias Tree could easily be the excuse to create the plant withering Blight Blade.