Nightmare's End and Mirage Split

Nightmare's End (ナイトメアブレイク) and Mirage Split (ミラージュスプリット) are twinned techniques which appear in Kingdom Hearts 3D: Dream Drop Distance. They allow Sora and Riku to meet from across their separate dream worlds and each summon half of an enormous, filigreed Keyblade, which they combine to perform several powerful slashes.

Mechanics
In Kingdom Hearts 3D: Dream Drop Distance, Nightmare's End and Mirage Split are Reality Shifts for The World That Never Was. Once the Reality Shift is started, several cycling chains appear on the touch screen. The player must use the stylus to cut through each chain's weak link with three cuts or less. Once Nightmare's End or Mirage Split is activated, the Combined Keyblade appears and Sora and Riku proceed to cleave apart nearby enemies or obstacles.

Kingdom Hearts 3D: Dream Drop Distance

 * Sora can use Nightmare's End to cleave the white-striped skyscrapers that block his path and fall from the sky.
 * Sora can use Nightmare's End during the fight against Xemnas to destroy the skyscrapers that Xemnas throws while also stunning him.
 * Riku can use Mirage Split to disable the nodes generating barriers throughout the Castle That Never Was.
 * Riku can use Mirage Split during both phases of the fight with Ansem.
 * Riku can use Mirage Split during the fight with Young Xehanort.