This is how Black Phantom explains his plan goes in Princess Twilight Sparkle Part 1.

[Black Phantom polishes his armor]

Black Phantom: Ah, music to my ears. Now to finish what I came here for.

Princess Celestial: Hold on, just what do you think you're doing?

Princess Luna: You must reveal your plan.

Black Phantom: Oh, stripping the Tree of its magic so I can use it for my own purposes. Since destroying your precious tree, there will be no more Elements of Harmony to defeat evil, such as myself.

Princess Celestial: Ha. Your plan won't work. The tree's magic will recognize your villainy.

Princess Luna: I agree with my sister.

Black Phantom: I've already got a solution for that.

[Black Phantom clicks his fingers and Arachnix appears]

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