Import shock, or Sudden Import Death Syndrome was a bug of the original Creatures game in which recently-imported norns would occasionally die for no apparent reason. It is interesting to note that slink originally intended for the later C1 norn breeds (Ron Norns and the like) to be overcome with a necromould later in life. However it seems that this was discarded in favour of a simple automatic-death gene due to import shock-related fatalities.