Mucus ad Nauseam Duo is a curse used to give a target enemy a very nasty cold. It is more powerful than a single cast of Mucus ad Nauseam Tria, and more effective than Mucus ad Nauseam Uno. No further casts of this curse have any additional effect on the target, but if the Uno or Tria modifiers are used in addition to the Duo variation, then the version of the spell with the highest power will take effect.