Devil, Rimepacted 2014
CR 6 fiend
Medium fiend, lawful evil
Magical darkness doesn’t impede its darkvision.
Emits a swirl of cold wind in a 15 ft. radius around it. Each creature that enters wind’s area for first time on a turn or starts its turn there: DC 15 Str save or knocked prone. Wind is nonmagical and disperses gas or vapor and extinguishes candles torches and similar unprotected flames in the area. At start of each of its turns rimepacted chooses whether this is active. While active rimepacted has disadvantage on Dex (Stealth) checks.
Advantage: spell/magic effect saves.
Can burrow only through nonmagical snowith ice.
Reactions
When a creature rimepacted can see is knocked prone by Frigid Vortex rimepacted can move up to half its speed toward the creature.
Source: Tome of Beasts 3 (Kobold Press) · License: OPEN GAME LICENSE Version 1.0a details