public function champion($identity, $championId)
{
$summonerId = $this->extractId($identity);
$response = $this->request('player/' . $summonerId . '/champion/' . $championId, [], false, false);
$mastery = new \LeagueWrap\Dto\ChampionMastery($response);
$this->attachResponse($identity, $mastery, "championmastery");
return $mastery;
}