Aust

UPDATE

After searching for literally about 18 hours I finally found a better solution. WordPress allows you to add filters on to the wp_authentication function. You can test for errors there and redirect if necessary.

add_filter('authenticate', 'check_login', 40, 1);
function check_login($user) {
	if(is_wp_error($user)){
		wp_redirect(site_url().'?login=failed');
		exit();
	}else{
		return $user;
	}
}