Answer:
i'm popular for Knuzlocks what am i
I am the fountain from which no one can drink. For many I am considered a necessary link. Like gold to all I am sought for, but my continued death brings wealth for all to want more.
A dagger thrust at my own heart, dictates the way I'm swayed. Left I stand, and right I yield, to the twisting of the blade.
What has two hands, a round face, always runs, but stays in place?
What moves without seeing and cries without eyes?
You use it between your head and your toes, the more it works the thinner it grows.
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What am I?