| Build time
| Evolves from
|| Heavy, Structure, Biological
The Greater Spire is evolved from the Spire (if there is a Hive present somwhere in the planetary vicinity) and it produces the genetic code that allows the Mutalisk to mutate into the Guardian or Devourer. It also provides the same upgrades as the Spire and will retain the evolutionary progress so that any aerial units keep all upgrades that were completed at the Spire.
In StarCraft 2, the Greater Spire
unlocks the mutation of a new unit, the Brood Lord
. This unit was originally mutated from a Mutalisk
, but it has now been changed to mutate from a Corruptor
. The Greater Spire still researches the higher levels of air weapons and carapace upgrades, as it did in StarCraft 1.