[Necromancer]

Level 9: Regulator

Find the first junction

After you start the level, you’ll have an opportunity to restock your ammo a bit. Pick up any items that are of use to you, then head through the small door nearby. You’ll find yourself in a sizable canyon, with a steam generator in the middle of a lake. You’ll be able to approach the facility from either the north, east, or west; any of the paths that you see stretching around the lake are viable ones. Any of the approaches are perfectly doable, although for most difficulty levels, the approach from straight across the bridge to the north is the easiest, especially if you have a few sniper rounds with which to lighten up the opposition. Take note of the merc in the tower to the east; he’s packing a rocket launcher, so be careful when he’s in sight. Don’t worry about getting up into the tower to steal the ammo from his body; he’s apparently been sealed in, Rapunzel-like.

The south end of the facility has a tower that’s connected to a "flying fox" device, which you can use to swing across to the entrance to the Regulator. The first room contains a truck and a few soldiers; kill everyone, then grab the health that’s in the back of the truck, if you’re running low. The next room over contains a few more soldiers; the merc on the catwalks possesses a Jackhammer, and now would be a good time to trade in your sniper rifle for a weapon that’s a bit more useful in close-quarters. Don’t miss the red keycard in the smallish room next to this one.

The stairs nearby lead up to a dank room that’s filled with excess canisters; needless to say, you don’t want to be getting loose with your gunplay in here. To the right of the stairs is another flight that leads up into a control room; kill the soldiers here, but watch out for mercs that may try to follow you up. Grab the keycard on the desk here and any goodies you require, then continue through the next door, which leads to a little grate-balcony overlooking the storage room below. Your night vision goggles will help you distinguish your targets; if you still possess an MP5, you can use it on single-fire mode to drop the mercs here without alerting them to your whereabouts.

One final keycard remains, in the smaller room on the second level of the storage area. After grabbing it, and looting the storage area for supplies, head through the door behind the keycard and shut off the steam, then proceed to the doorway in the hall behind this room and shut off the first junction. From here, you’ll have to return to the room with the discarded oxygen canisters, shut off another valve, then proceed to the second valve.

Find the second junction

Find the third junction

Find the control center

The next pair of junctions are directly beside each other, so shut them off, being careful to avoid getting killed by the sterile-suited merc in the third room, and head on to the control center. Inside, you’ll find a couple more goons; kill them, avoid picking up the health kit unless it’s drastically necessary, and flip the red switch here to start overloading the station.

Hide in the vent shafts

Your goal now is to find a spot to hide. Er, to heroically find a spot to hide. Your ventilation shaft is on the far side of the nearby courtyard, but a couple of troop transport helicopters will be dropping mercenaries into it, giving you anywhere from 6 to 10 soldiers to fight before you can reach the end of the level. If possible, lure them back towards the door and shoot them as they come through. Don’t forget to use your night vision goggles to put the spotlight on them.