Mine would be invisibility so I can prank and troll the crap out of people and the sparrow so I won't have to ride my bike everywhere. Plus glide would be really fun. What would yours be?
EDIT: going for 200 replies
EDIT: wow. 300?
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Radiance with the Fireborn perk. Die brutally once a day, scare the -blam!- outta people, come back and scare em even worse.