* CrowningMusicOfAwesome: Dark Lord/Emperor's battle theme from Streetpass Quest 2.
* DemonicSpiders: Any enemy that takes very litte damage from your attacks, or uses any type of magic (e.g Fortifying magic, Mirage magic, Level Down Gas, Nullifying Magic) in Streetpass Quest 2 / Find Mii 2.
** Mummies are especially infuriating since they can cost you a hero before you even do anything.
** Some of the reaper enemies will spew Cursed Gas, which prevents you from doing anything unless you use the Dispelling Draft potion.
* ThatOneLevel: Colored shields. They block all sword attacks except from heroes with shirts of matching color. Magic goes around the shield, but at minus 2 damage. [[LuckBasedMission God help you if you don't have a friend to boost you.]]
** Rooms covered in darkness can ONLY be passed by White magic, disallowing brute-forcing fire magic, and forces all other heroes in front of the White hero to flee. Unlike shield rooms, you can't re-order your heroes to put White in front.
** Even worse, you could reach the maximum number of heroes and NONE of them are white, resulting in all ten of them running away from the dark room. On the bright side, once the room is lit, you never have to light it again when you run out of heroes.
** Not to mention the Poison Rooms, in which the same applies, but needing the even rarer Yellow Miis.
* ScrappyMechanic: Some of the potions you order may turn out to be defective, wasting a hero AND your Play Coins.