After you used the Omphalos you had trouble controlling your energy. Talk to Muto.

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Introduction

Omphalos glowed in response to your power, but you became distracted and lost control of your chi. As Muto warned you, the forces of heaven and earth are not in tune within your body.

NPC Dialog

Quest Completion

I told you to slowly release your chi! You're not
ready to completely control the heavenly power of a
demigod yet, that is why we use the powers of earth
channeled through the Omphalos to teach you. If
you were not a demigod you would be dead, but
you cannot maintain these warring powers within
your body. Speak with Budle within ten minutes!