Tales of the Valiant Players Guide (pg. 261)
4th ring Primordial, Necromancy
Necromantic energy washes over a creature of your choice that you can see within range, draining moisture and vitality from it. The target must make a CON save. It takes 8d8 necrotic damage on a failed save, or half as much damage on a successful one. This spell has no effect on Constructs or Undead.
If you target a Plant creature or a magical plant, it makes the save with disadvantage, and the spell deals maximum damage to it.
If you target a nonmagical plant that isn’t a creature, such as a tree or shrub, it withers and dies.