Overview
I hope this can help you !
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Note before getting into the guide: We got to the Keeper with 3 players. With this info, I believe this EE CAN be completed with any player count.
Step 1 – Build all 4 Bows.
I’m not going to bother explaining every step for building the 4 bows as there is plenty of guides out there. Find one and follow it for this step.
Step 2 – Build the DG-4.
Once again, plenty of guides on how to get the pieces. Follow them and get this built.
Step 4 – The Wisp (Step 4 and 5 must be done during 1 round – need confirmation)
Grab an unupgraded bow and shoot the ball points of the teleporter prongs to turn them a gold/red hue. This will trigger the wisp to spawn. During this step a random item (there are 8 predetermined items) will glow blue. The locations are as follows: Radio in the corner opposite Speed Cola, Clock above Comms Room, Clock in the hall leading from the clock tower to the Comm Room, Phone between power switch and Stamin-Up, Globe by Sam’s room, Box in the room above Double Tap, Car tire by Double Tap, Phone at Spawn.
One will randomly glow blue. Once found, shoot it with your bow to move it to the next area. You must shoot 4 in a certain amount of time. Once all 4 are shot, the teleporter will turn purple. Take it back into the past and you will need 3 things. The Soul Can, the tesla coil, and the safe code. Be sure to get all 3.
Step 5 – Charging the Tesla Coils (Step 4 and 5 must be done during 1 round – need confirmation)
Once back, go to the death ray and place the fuse in it. Set the dial to Protect and activate it for 1,000 points. Once it’s done, go to the computer by the clock tower and enter the code from the safe by pressing square at the corresponding images. This will open the safe.
Inside the safe will be a keycard and two coils. Pick them up and go back to the death ray. Once there, look for the giant tesla coils. They will both need a coil. Press square to insert it. Set the death ray to destroy and activate it again, for 1,000 points.
Now, an infinite dog round will start. You must go to the computer by the clock tower, and the one at the Launch Pad to play Simon Says. You MUST complete both perfectly. if you mess up, you have to start over. If done correctly, the green button on the back of the death ray will be lit. Activate it and this will cause the rocket to crash into the courtyard below you. Head down, and pick up the Golden Rod from the rocket.
Step 6 – The Keeper
Now you have to repeat the Wisp step. Once all 4 are hit, head back in time once more. Near the front of the room will be a black case that will automatically open. Inside is a tablet. Pick it up.
Once collected and returned, go to the Knight (next to the bow) and insert the Golden Rod. This will spawn a Keeper who will move around the map for souls in a fashion similar to the Wolf.
Before starting the area by the car, be sure to place the tablet. The other 3 locations will not require this.
When he stops, there will be a white circle on the floor. The more players inside the circle, the bigger it gets. When standing inside, there will be a color at the bottom of your screen that corresponds to what bow must be used to collect the souls. Keep using that bow to kill until filled and repeat for the other 3. Once completed, he will return to the pyramid at Undercroft.
Step 7 – The Fight
Once at the pyramid, place the soul canister on the pyramid and get set up for a boss fight. When you’re ready, all players must place their Ragnarok on the gravity pads to trigger the fight.
In the center of the room will be a giant Keeper. He has a myriad of attacks plus enemies (skeletons and Panzers) to avoid. What you must do is keep an eye out for a ball of electricity in the center of the room. once there, place your Ragnarok to stop it from activating. If done properly, his chest will glow yellow. Lay into it with your bows. If you fail, hide behind a pillar to not be insta-killed by the discharge that will follow.
Repeat until he is defeated. In front of the pyramid will be a Summoning Key for you to pick up. Pick it up and take it to the bell tower computer. Once placed, you did it. Victory. Huzzah!
I hope this guide helps you and clears up any confusion about certain steps.
Update 1: The clock tower is NOT a required step.
Update 2: The black case from step 6 does not open automatically. You must press on the apothicon book near the fuses for the death ray. Then it will open. (thanks Cri)