Malevolent Waves 2014

8th-level abjuration

Casting time: 1 action
Range: Self
Components: V, S, M (a profane object that has been bathed in blood)
Duration: Concentration, up to 1 minute

You create an invisible miasma that fills the area within 30 feet of you. All your allies have advantage on Dexterity (Stealth) checks they make within 30 feet of you, and all your enemies are poisoned while within that radius.

Source: Deep Magic for 5th Edition (Kobold Press) · License: OPEN GAME LICENSE Version 1.0a details