Belief Warping
The user can warp the fabric of reality according to their beliefs. If they believed they were super strong and/or super fast, they would become so. If they firmly believed in fairy-tales and mythic creatures, the tales and creatures would come to life, as well as mimicking them if they believe that they can do what the creature can do. Essentially, the user can become able to achieve nearly anything if they believe it.
English
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Whoa. That sounds -blam!-in awesome man.