Soul-Less, the main Easter egg of Attack of the Radioactive Thing in Infinite Warfare Zombies: the zombie and the key, the chemical station, the bomb parts and nuclear codes, the colour of the film, the compound and the fight against Crog-Zilla.
Soul-Less is the main quest of Attack of the Radioactive Thing: recover the fourth piece of the Soul Key, which Crog-Zilla hides in its antenna. It needs the power, the Pack-a-Punch, the Crowbar, the Cleaver and the Seismic Wave Generator. Its completion unlocks the achievement of the same name, and the trophy Unpleasant Dreams when it is done as Elvira.
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Step 1: the key
A zombie must be rebuilt on the green gurney of the spawn tent. Its parts:
The head
Inside the RV of the trailer park, reached through the button of the Projection Room.
The torso
Inside the freezer of the Beachside Market. Repair the freezer trap with the power box found by the gas station, use it, then hit the hanging meat with the Crowbar to reach the torso.
The arms
One in a fire pit of the trailer park; the other is the arm on the beach that held the power handle, freed with the Seismic Wave Generator.
The legs
One from a Radioactive Soldier zombie killed with the Cleaver; the other in a tree next to the door from the Racin‘ Stripes area to the TV studio, shaken down with an explosive.
Then four more items: the mirror of Elvira, on her couch once she has left it; a car mirror, broken off the crashed white car in front of the market with the Crowbar; a broken mirror from the restrooms of the trailer park, also with the Crowbar; and a punch card on the desk next to the Skullhop machine.
Place the three mirrors in the tent: on a table next to the gurney, on the wooden crates and on the MRE crates.
Put the punch card in the typewriter by the wooden crates and use it. A light runs over ten dots, the digits 0 to 9.
Type the code, five digits made of 3, 4, 5, 6 and 8. Their order is given by the film reels of Extinction maps in the TV studio, across from the couch of Elvira: Mayday is 3, Awakening 4, Point of Contact 5, Nightfall 6 and Exodus 8, and the last digit is always 8.
Fire the life ray next to the typewriter: the corpse becomes a zombie.
Type the same code backwards and fire again: the zombie becomes a key.
The tent also holds one of the six chalkboards of the chemistry step, with the diamond of each ingredient.
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Step 2: the chemical station
The key opens the garage of the gas station. Its chemical station is built on the work table with three parts: on the couch in the back office of the market, on a bench on the hill from the beach to the trailer park, and on a bench of the trailer park next to an open RV.
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Step 3: the bomb and the codes
Bomb parts
Under a crashed red car on the road between the motel and the TV studio, next to the door from the Racin‘ Stripes area to the TV studio, and under a wooden bridge on the beach, below the concrete bridge.
The pressure gauges
A four-digit code is written under the desk of the market office. Four gauges, hit with the Crowbar, must stop on its digits: near Blue Bolts in the power station, next to Quickies, in the motel room behind Bombstoppers and behind the gas station.
The nuclear codes
Once the four gauges are set, a safe in the market office opens and gives the codes.
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Step 4: the colour of the film
The colour of the map must be set with the television of Elvira, according to the „Eye“ number:
Read the number of the m-shaped symbol in the motel office, above a couch with a radio.
Find the right O-shaped symbol among four: under the concrete bridge, in the RV of the Projection Room, at the back of the market office above a fridge, and on the door of the gas station. Changing the colour to red, then green, puts a slash through the false ones; the right one keeps its equal sign in all three colours.
Multiply the two numbers: the result is the „Eye“ number, which gives the colour to set on the television. Keep it for the next steps.
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Step 5: the compound
Two radios, near the gauge of the power station and on the couch of the motel office, tell which of four compounds the bomb needs once they get a battery, dropped at random by zombies with backpacks. The compound is made at the chemical station from household items found around the map, from the vodka of the market to the insect repellent of the spawn tent. Each reaction asks for a number: the sum of the numbers of the ingredients, read on the diamonds of the six chalkboards, minus the number of the O-shaped symbol. The diamonds change with the colour of the film, so only the right colour gives the right numbers.
The compound then goes into the atomic bomb of the chemical station, with the three bomb parts.
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Step 6: the Radioactive Thing
Take the book pages in the chemical station and use the bomb: it teleports to the beach.
Escort the bomb by standing next to it, under the fireballs and the Crogs of Crog-Zilla. At the end, the monster swallows it.
Fire the Death Ray cannons at the weak spot on its chest, avoiding its laser beam and its ground slam, which can down any player in its path.
When it stops attacking, use the bomb cart. Crog-Zilla spits acid all over the beach and sends Crogs: hold out under the bridge.
When the acid is gone, cross the laser maze and reach the cart in time. The players are teleported inside Crog-Zilla.
Each player types the nuclear codes, the same way as on the typewriter. A failure sends the players back to the cart, with a shorter acid phase.
The reward
The ending cutscene, the achievement Soul-Less, and Belly of the Beast if the codes were right on the first try. Elvira then becomes playable with a code in the pregame lobby.