Spire

Cost of the 1st level:

800100250CRP 1.7
A Spire helps to signal the swarms outside of your planets and explore more complex forms of mutations. The spire can send the fleet with any order. During the defense of your planet Spire is the center of communication of the allies on low orbit. Each level allows you to support 2 players in defense. Allows the larvae to mutate into Dreadlisk, Guardians, Devourers and Pancors.
Comparison by level
Lvl The number of allies in defense
1 2
2 4
3 6
4 8
5 10
6 12
7 14
8 16
9 18
10 20