A potion of gaseous form was an magic concoction that appeared as moving fog, but poured like water. When consumed, this potion would transform the imbiber's body, along with all of their carried equipment, into a transparent and insubstantial sluggish cloud of gas. The gaseous form could squeeze through anywhere that was not airtight.
While in this form, the imbiber could only move slowly, around 100 feet per minute, and was resistant to nonmagical damage. These effects could last for one hour, though the imbiber could return to their true form at will.