Chasers are evil, they use a power of light. They are people who hunt down the keyblade wielders - hence the graveyard of keyblades, the graveyard holds the keyblades of all the keyblade wielders they killed. They use light for their evil deeds, because darkness can be used for good also. The secret video was set in the past, the man walking towards them is xehanort, he was the last keyblade wielder remaining, he was heading for the chasers for a final showdown. He beat them but was killed in the process, thus the past affecting the future. Because no more keyblade wielders were left new ones were made/born(w/e), Sora, Riku, Mickey and Roxas. Because keyblade wielders were born, new chasers came after them. thats what the video was hinting at.
this is my theory, feel free to comment.
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this is my theory, feel free to comment.
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