Lungburst

6th-level biomancy*

Casting Time: 1 action
Range: 90 feet
Components: V, S
Duration: Instantaneous
Class: Sorcerer, Warlock, Wizard

You cause rapid and unpredictable changes in the internal air pressure of a creature you can see, rupturing its breathing apparatus. The creature must make a Constitution saving throw. A creature that is holding its breath makes this saving throw with disadvantage. On a failure, a creature takes 7d6 thunder damage, 7d6 necrotic damage, and immediately begins suffocating. On a success, a creature takes half as much damage and does not begin suffocating. A creature suffocating in this way can repeat the saving throw at the end of each of its turns, ending its suffocation on a success.

A creature that does not need to breathe is immune to the effects of this spell. A greater restoration, heal, or wish spell can restore a creature’s ability to breathe, and end its suffocation.

At Higher Levels. When you cast this spell using a spell slot of 7th level or higher, the thunder and necrotic damage both increase by 1d6 for each slot level above 6th.

*can be replaced with evocation
Source: Heliana's Guide to Monster Hunting