Eversmoking Bottle

When you use an action to remove the stopper a
cloud of thick smoke pours out in a 60-foot radius
from the bottle. The cloud's area is heavily
obscured. Each minute the bottle remains open
and within the cloud, the radius increases by 10ft
until it reaches its maximum radius of 120 feet.
The cloud persists as long as the bottle is open.
Closing the bottle requires you to speak its
command word as an action. Once the bottle is
closed, the cloud disperses after 10 minutes.