Unseelie's Winter

You draw the life force from every creature in a 40-foot cone centered within range. Each creature must make a Constitution saving throw. Constructs and undead aren’t affected. Plants and elementals except ice make this saving throw with disadvantage. A creature takes 2d6 necrotic damage on a failed save, or half as much damage on a successful one.

Nonmagical trees and shrubs, wither and die instantly.