The drake exhales poison in a 15-foot-line that is 5 feet wide. Each creature in that line must make a DC 15 Dexterity saving throw. On a failure, a creature takes 17 (5d6) poison damage and its size is reduced by one category until it completes a short or long rest. On a success, it takes half the damage and isn't reduced in size. This breath can reduce a creature's size to no smaller than Tiny.