noun

a feeling or state of intense excitement and happiness.

in his euphoria, he had become convinced he could defeat them

elation,happiness,joy,joyousness,delight,glee,excitement,exhilaration,animation,jubilation,exultation,ecstasy,bliss,rapture,rhapsody,rhapsodies,intoxication,transport(s),cloud nine,heaven,paradise,seventh heaven,the top of the world