Fire Emblem Jugdral/Nightmare Fuel

• The very idea of how the Battle of Barhera developed. Think about it: Not only do you see your leader being burned to death by the local Magnificent Bastard, but immediately afterwards your whole army is decimated via a particularly horrifying and fiery Death From Above via a Meteor shower of sorts. SERIOUSLY, NOT COOL.
• The Child Hunts. Children are forcibly taken from their families to be sacrificed to an evil god.

YT commenter: There's hardly a more faith-rocking experience than losing this many friends in one sitting. (...) Though, to be honest, the little Fire Emblem sprites of the mages casting Meteor are just a little too... cute... to truly affect any person. I'd love a remake of this game.

• Oosawa's rendition of Sandima's Fenrir spell is really not pretty.