1.Digging the terrain, Using the mouse to drag the way.
and let Phantom to attack the LS the top of the room.
Do not destroy the phantom coil or other buildings,
which will change the direction of the phantoms.
2.use fishing the way, Let Drone through the Micro Rift.
Bait and fish need to move together, the fish will follow over.
(I thought it should be a lot of people know about this method.)
Blaster to clear the rest of the creepers.
So you can get the Reactor.