Note: By the time you get to this area you should have picked up two Forge 
Stones. Go to Forge, and buy the Evil Eye Helmet. This gives you two Lifeforces 
instead of one for each collected. Go to the area where you need to recover the 
Green Hive. When you are making your way out with it, you will reach an area 
with two big opponents that shoot the blue beam gun. One will be roaming up top, 
and the other stands next to a wheel to open the door next to him. In the same 
room is a floor plate to release the gnomes behind a cage door. Release the 
gnomes, and use them to help kill both of the blue beam gun opponents. After 
they are dead, return to the gnome cage and open it again. They will keep 
respawning. Try setting yourself near the top of the stairs going down while 
facing toward the cage. Then, send out your minions. While they are out hunting, 
set your controller to keep sending out minions. When not killing, they are 
collecting Lifeforce at double the rate due to the helmet.