The Council Era/Omicron

''Omicron, the planet closest to the Rachni's Mass Relay is under constant attack. The Rachni come and the Rachni retreat. Most often this is where the Council sends species to weak too withstand the constant strain of Rachni on Ragnora. If the Council is able to hold the enemy at bay, they may just win the war early.''

Both

 * Omicron blues