Mine, Gas

Unlike grenades, which explode shortly after being thrown, mines are designed to detonate once a specific trigger occurs. As an action, you can set a mine in an unoccupied space within 5 feet of you. When you set a mine, determine the circumstances under which the mine will detonate. For example, you can set the mine to detonate on a timer, when a creature enters the mine’s space, or under other specific circumstances (such as when a door opens or a vehicle activates). You can also rig the mine to detonate remotely using a remote detonator.

When detonated, a mine functions identically to the grenade it emulates.

When detonated, a gas mine creates a 10-foot-radius sphere of poisonous gas. A creature that enters the cloud for the first time on a turn, or that starts its turn inside the cloud, makes a Constitution saving throw. Creatures that don’t need to breathe automatically succeed on the saving throw. On a failure, the creature is poisoned for 1 minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. The gas spreads around corners, and its area is heavily obscured. It lasts for 1 minute or until dispersed by a moderate wind (at least 10 miles per hour).