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The Reaper is an enemy that has so far appeared in all games of the Kid Icarus series. They usually appear on their own, ignoring anything that passes through them. However, if they see Pit, they will zoom into the closest spot available and will summon Reapettes until either they or Pit are defeated, or when Pit moves out of its sight.
The Reapers have appeared in Super Smash Bros. for Nintendo 3DS as Smash Run enemies, although they are treated as bosses. Like in their series of origin, they walk on their own until they see the player, at which point they stop and start summoning Reapettes. While they are summoning Reapettes, the current playing music will change into 8-bit music. If players get close to the Reaper, the Reaper swings its scythe at them. Reapers can be stunned with powerful attacks unlike most boss enemies. If the Reaper is defeated, it may release stat boosts and even items including the Heart Container. Finally, some events in Smash Run optionally has the player defeat a Reaper for the reward of large stat boosts.
Super Smash Bros. for Nintendo 3DS Trophy information