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Description
In Kingdom Hearts 1, there's a point during the End of the World where Sora, Donald, and Goofy are traveling through an area called the World Terminus. In it are several locations with platforms above and below a glowing light. Entering the light causes you to return to one of the worlds you've visited earlier in the game, but only temporarily. This is because the End of the World is itself a Heartless world, and it's connected itself to those worlds in an attempt to draw them in and consume them.
Here, Chara and Asriel's hearts/SOULs are connected, but they're cooperating, rather than conflicting.

Description
In Kingdom Hearts 1, there's a point during the End of the World where Sora, Donald, and Goofy are traveling through an area called the World Terminus. In it are several locations with platforms above and below a glowing light. Entering the light causes you to return to one of the worlds you've visited earlier in the game, but only temporarily. This is because the End of the World is itself a Heartless world, and it's connected itself to those worlds in an attempt to draw them in and consume them.
Here, Chara and Asriel's hearts/SOULs are connected, but they're cooperating, rather than conflicting.