A Wave of invisible necrotic energy spreads from you out to a radius of 60'.  Any organic matter, not worn or carried, within the spell's area of effect rapidly ages and decays; small non-sentient plants die, wooden structures age, organic textiles such as canvass, silk, linen  will become obviously brittle and worn. Each creature ( This spell does not differentiate between friend or foe )  in a 10-foot-radius of you must make a Constitution saving throw. Creatures take 3d6 necrotic damage on a failed save, or half as much damage on a successful one. and you regain hit points equal to half the amount of necrotic damage dealt. A creature made of inorganic material such as stone, crystal, or metal has advantage on this saving throw.

A magical object that isn't being worn or carried does not take the damage if it's in the spell's area. 

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 1d6 for each slot level above 2nd.