The Eversmoking Bottle magic item has the following details:
Smoke leaks from the lead-stoppered mouth of this brass bottle, which weighs 1 pound. 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 10 feet 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. A moderate wind (11 to 20 miles per hour) can also disperse the smoke after 1 minute, and a strong wind (21 or more miles per hour) can do so after 1 round.
What happens if a very fast creature opens the bottle, then immediately moves far away from the smoke (e.g. 500 ft.)?
- The smoke follows the creature to the destination, but without leaving a trail on the way
- Smoke is generated along the way as well, making a 60ft wide, 500ft long line of smoke
- Smoke is only generated at the start of the creature's turns, so if he stops 500ft away and waits for his next turn, a single new 60ft cloud will be made there
- The smoke is only generated once (upon opening time), no additional smoke will be generated neither on the way to the destination, nor at the destination itself
- Other behaviour