When you enter Gonarch's lair, wait for the beast to come galloping out of her cave. Use some heavy weaponry on her, aiming for the sac dangling beneath her armored shell. When the small insects attack you, use the Glock or the Crowbar to get rid of them. They're a nuisance, but they'll do a lot of damage, a little at a time. When you've done some damage to Gonarch, she will go running off into the cave. Don't follow yet. Pick up the ammo and HEV power lying around the dead Scientist. There's also a health pool on a platform floating off to the side if you need it. Now follow Gonarch.

	Killing Gonarch will take some persistence.

In the second chamber, keep attacking. Avoid the covered pit in the center of the area. There are some items down below, but it's a long fall if you miss the ledge. Continue fighting Gonarch until she breaks through the mesh into the next area. Kill the accumulating insects and follow Gonarch.

Drop down to the thin ledge with the glowing crystal on it. Then drop down into the tunnel. Chase Gonarch down the tunnel. As you fall into the next chamber, try to land on the mesh before falling to the ground to avoid taking damage. Grab the HEV power and ammo, then continue shooting Gonarch. She will fall through the mesh onto the ground. Shoot her until she dies. Fall down the hole her death rattle creates into the teleporter.