A hydra can be given a specific number of heads by calling it
          an "n-headed hydra" (with a maximum of 20 heads):
              MONS: four-headed hydra
          A slime creature's size can be set to other than normal using
          the prefixes "large", "very large", "enourmous" or "titanic":
              MONS: very large slime creature

          Limitations: If an item in the item list has alternatives,
          there's no way to force all monsters dervied from that monster
          spec to choose the same alternative.  If a monster is given
          a random launcher, there is no way to force the ammo type to
          match the launcher type.

          Limitations: If an item in the item list has alternatives,
          there's no way to force all monsters dervied from that monster
          spec to choose the same alternative.  If a monster is given
          a random launcher, there is no way to force the ammo type to
          match the launcher type.