 They use a hive mind to pass memory to their hosts, which also passes an individual's knowledge, given to a broodling, to the hive and back to the queen, meaning newborn brood know what any member of a race knows.Until the embryo gains the host's body the embryo can only gain temporary control of the host, often without the host noticing as the host is unaware when it loses control.If the host possesses any genetic powers, the resultant Brood will inherit them.