How do you get the imperialist in Metroid prime hunters?

Answer 1

In the sic transit of arcterra, You will notice a magmaul door close by. Open it and proceed through the corridor to access a room where you'll be greeted by 4 quatroids. Kill them all to unlock a shield that is guarding the next part. Once you go through the newly opened area, you will be greeted by an arctic spawn. This is very much similar to the fire spawn you faced on Alinos, except that it's blue, it can move to any part of the room, and it will throw ice projectiles at you and freeze you if you get hit. It has the same weak point as the fire spawn, the mouth so blast the Magmaul in it to damage the creature and eventually kill it. Upon the arctic spawn dying, the imperialist will appear on a small pile of rubble by the door.