In One Piece, You're Guaranteed a Top-Tier Devil Fruit Every Time You Sign In

I've been transported to the world of One Piece, and I'm signing in to receive a Devil Fruit every month. I start with Enel's Rumble-Rumble Fruit, and everyone's levels appear before my eyes: Supernovas 60-70, Admirals 90+. At the East Blue restaurant, the moment Hawkeye instantly kills Zoro with a single strike, I'm enveloped in lightning, catching the black blade. "A 50/50 chance? No, I haven't even warmed up yet." The level 87 number above Hawkeye's head flickers slightly. Nami angrily scolds me for provoking powerful enemies, and I teleport over to shut her up: "Lightning speed, understand?" Looking at the 99% sign-in progress bar on cooldown—what kind of overpowered ability will I get next month?