Warning: contains spoilers for Silver Surfer Rebirth #2!
The single strongest Infinity Stone is actually the weakest in the Marvel Cinematic Universe — and Thanos has just lost it. The Mad Titan is strongly associated with his conquest of the six Infinity Stones (called gems in the comics) and has not hesitated to use one or all to kill anyone in his path to Godhood (or his path to court Death, depending on the source material). ButSilver Surfer Rebirth #2 plainly states that one Stone is more powerful than the other five — and it's not the all-powerful Time Stone.
Norrin Radd, the Silver Surfer, speeds through the cosmos on his board, now free from the grip of Galactus, his former master (the event was chronicled in the famed Galactus Trilogy of Fantastic Four fame). The Surfer suddenly finds himself in a battle alongside Mar-Vell — a hero who has long since passed. The Surfer is puzzled but has no time to think, for a bright flash of light brings him to a mysterious planet and face-to-face with Thanos himself.
Related: Thanos' Original Infinity Stones Plan Proves The Gauntlet Is Essential
A fight begins and the reader can see that Thanos and the Surfer — even while the latter is imbued with the Power Cosmic — are relatively evenly-matched. But Thanos doesn't seek the Surfer's death, but rather his aid. «Does it trouble you? Do you perhaps question reality itself?» asks Thanos, before revealing that the Surfer has every right to question reality: the Reality Stone has been stolen.«The most powerful of them all, the Reality Gem, [Adam Warlock] entrusted to me.»
In the MCU, the Reality Stone (at least by itself) is little more than a glorified illusion device. Thanos can disassemble Drax and Mantis and show Doctor Strange
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