The Brown Note!

A long time ago, a Bard's paramour left him to marry a wealthy noble. The Wedding was to be decorated only in white to represent the purity of the couple's love. Intense with jealousy, the Bard (who's name has long since been forgotten) sold his soul to a devil for revenge! The Devil taught him a forbidden tune that the Bard would then use to turn the happy pristine white wedding into a odorous brown nightmare filled with regret and terror. The Bard was later apprehended and executed but not before passing on his forbidden tune to another aspiring musician!    

Feared by creatures who like to wear pristine white pantaloons, and laundromats in all the realms comes...The Brown Note!  With a simple mundane instrument and knowledge of a secret forbidden tune, a Bard may play an indescribable and horrific sound that can force all living creatures within a 100 foot radius to violently evacuate their bowels and defecate themselves. Be warned though, the caster may also be subject to intense exhaustion, embarrassment, dehydration and poor social reception (until they bathe) as well. 

All Creatures within 100 feet of the caster must make a CON save. Upon success a creature suffers no effect. Upon failure the creature feels a sharp tensing and pain in it's abdomen quickly followed by an explosive smattering of fecal matter being violently erupted from the the creature's anus. Even creatures who had just recently used the toilet are still subject to this effect. Creatures who have defecated themselves suffer 12d10 psychic damage from shock, awe, embarrassment and shame. Creatures who failed their CON save also suffer 3 levels of Exhaustion due to severe dehydration. Last but not least any creature wearing pants while failing their CON save will suffer disadvantage on all Persuasion (Charisma) rolls until they have bathed. The Cantrip Prestidigitation can only clean clothes and not individuals, as such it cannot be used to negate the disadvantage on Persuasion (Charisma) rolls. Creatures with no functioning digestive tracks (such as Warforged, Reborn, or Iron Golems) are immune to this spell. Creatures not wearing pants (such as a dog or Wild Shaped Druid) do not suffer the disadvantage on all Persuasion (Charisma) rolls after the spell has been casted. Creatures in a zone of silence are immune to the effects of this spell. Deaf creatures are still affected by this spell as it's sub sonic pitch still vibrates the bowls to cause the violent expulsion of feces. Last but not least the caster is immune to the Psychic Damage from the spell but not immune to defecating themselves nor the Disadvantage on Persuasion (Charisma) rolls after.