The Fog Spreads Around Corners

When a creature enters the spells area for the first time on our on a turn, it starts its turn there. That creature must make a constitution saving throw and well, we should start with that. They're affected even if they hold their breath. The fog spreads around corners. It lasts for the duration or until strong wind disperses the fog. Good luck indoors, ending the spell. Its area is heavily obscured.