Spire

The zerg spire is based on the towering spires of the mantis screamers, although altered to be sustained with creep.

StarCraft
The spire produces the genetic code that allows larvae to morph into mutalisks or split into pairs of scourge. It is capable of mutating into a greater spire after a hive has been developed, enabling the hive cluster to produce guardians and devourers.

StarCraft II
The spire is set to appear in StarCraft II. It functions identically to its predecessor.

The spire can be transformed into a greater spire.