Humans are often seen as the most plain race by non-humans. Your bardic magic lets your enemies understand how that feels. You will make them understand what it's like to be just another brick in the wall. Once affected, they spout their apathy like an angsty teenager, making it harder for their companions to shake the malaise.

Enemies within a 20-foot radius become incapacitated. Creatures within range make a Wisdom saving throw against your spell DC. A successful save prevents the effect. Creatures affected by this spell may attempt the saving throw on each of their turns. Each affected creature within 5-feet of the creature reattempting the save increases the save DC by 1.