code: public Future<Mastery> getMastery(int id, MasteryData data, String version, String locale) {
          return new DummyFuture<>(handler.getMastery(id, data, version, locale));
      }
docs: <p>
  Get a specific mastery
  </p>
  This method does not count towards the rate limit and is not affected by the throttle
  @param id The id of the mastery
  @param data Additional information to retrieve
  @param version Data dragon version for returned data
  @param locale Locale code for returned data
  @return The mastery
  @see <a href=https://developer.riotgames.com/api/methods#!/649/2175>Official API documentation</a>