The al-Aeshma has advantage on attack rolls against airborne opponents.

The al-Aeshma must always be anchored to the earth. Even in gaseous form or sandstorm form, part of it must always touch the ground. The al-Aeshma’s maximum altitude while flying is 50 ft. If it is not touching, it loses its immunities and gains vulnerability to lightning and thunder.

When an al-Aeshma dies, its body disintegrates into a swirling spray of coarse sand, leaving behind equipment it was wearing or carrying.

As a bonus action when in gaseous form, the al-Aeshma can befoul its space with a choking scent. When the al-Aeshma moves through another creature’s space in gaseous form, the creature must succeed on a DC 18 Constitution saving throw or be incapacitated until the end of its next turn. Ill Wind lasts until the al-Aeshma leaves gaseous form or chooses to end the ability as a bonus action.

The al-Aeshma regains 10 hit points at the start of its turn. If it takes fire or radiant damage, this trait doesn’t function at the start of its next turn. The al-Aeshma dies only if it starts its turn at 0 hit points and doesn’t regenerate.