Ureni's Withering Ray

You create three rays of necromantic energy and hurl them at targets within range. You can hurl them at one target or several. Make a ranged spell attack for each ray. On a hit, the target takes 2d6 necrotic damage. If this damage reduces an organic target to 0 hit points, it dies instantly and withers into a husk. Inorganic targets such as constructs (except wood or flesh constructs) do not wither but are not immune to this spell's damage. This spell automatically causes up to a 10-foot cube of non magical plants, excluding plant creatures, to wither on a hit.