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Defeat the Primagen.

This is the final boss fight and can be quite tough.

Here is some tips to ensure victory:

Make a save before entering the fight
Try and ensure you have full health and ammo before entering
Stick to the outside of the arena but not too close to the edge.
When he drops bombs from the ceiling avoid the middle and keep moving.
When the flies come you could either use the nuke or use another gun to shoot them out the air and save the nuke for the primagen
For the Primagen himself aim for the parts glowing red.



Achievement is worth 100 Gamerscore.