Mine would be telekinesis. Imagine how useful that would be.
[spoiler]The luckiest seven you will ever meet[/spoiler]
Edit: That's... a lot of replies.
Edit 2: Since when do I make quality posts? Thanks for the comments and upvotes. There are some interesting powers people want out there.
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The ability to manipulate blackfire from dark souls. Like pyrokinesis but 10x cooler.