Hyperforge Fabricator
(50% Upgrade) Artifact: 18
Hyperforge Fabricator
(100% Upgrade) Artifact: 24
or perhaps
Assimilation Locus
(100% Upgrade) Mining: 8, Population: 400
maybe
Inverse-Flux Satellites
(100% Upgrade) Cloak: 1600
Just gonna provide the link to the information you want.
For defense, attack, cloak, and population structures.
http://galaxylegion.com/wiki/index.php/ ... _ProtocolsFor assimilation locus
http://galaxylegion.com/wiki/index.php/ ... _ProtocolsThese are what people use to upgrade production structures. Limited artifact so think carefully before using.
http://galaxylegion.com/wiki/index.php/ ... _Energizer