You'll also find a Mega Health behind one of the artefacts. Once they're dealt with, you'll find an Eliteguy collectible by going to the left side of the area and looking for an opening which will lead to it. Go into one of two doors and then open the gate, which will spawn some demons. Once they're all killed, in the back of the room you'll find a panel between two doors that will open a gate containing an Elite Guard. There is, however, a Quad Damage powerup here that can help you out. Then head into the next area by dropping down the hole and you'll fight a lot more demons here. Once that's been completed, keep going through and kill the demons past the hallway. You'll find a white hatch on the floor you can kick to get directly to it. On your left, you'll find a Rune Trial behind a door there.

In the next room, defeat the demons here and then go up the stairs. Behind the destroyed pod there, you'll find a hole that will lead you back to the room with the door on the left, which leads to a hall containing some demons and a Data Log.

However, in the right side of the area you will find an opening that will lead to an AutoMap machine. In the next room, you should find a door on your left. Then jump up through the hole in the roof and continue down the path. Going through that door now, continue down the path until you reach a room with a Field Drone. Before you go inside of it, though, behind you will be a small opening that you can jump to. Once you've dealt with all the demons, go into the next hall, kill the Imp that spawns, and then climb up and you'll see a door. There will also be a Haste powerup that you can pick up to deal with all of the demons that will spawn, since there will be a ton from this Gore Nest. Then you'll fight some more demons and in the next area you'll find a Gore Nest. In the next room you'll find some crates behind them you'll find a Mega Health there. Then go down the hall but beware of the demons that will attack you. Once you've obtained it, go down the elevator shaft and kill the demons there. In here you'll find a new weapon, the Siphon Grenade. Then, pick up the Data Log on one of the counters and then go through the door then go into the next room. After finishing Mission 8: Advanced Research Complex, you'll activate another hologram.

How to beat the cyberdemon in doom