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Text Tutorial:
1. Pick up a skull. In the middle of the ritual site is an altar with four black skulls on it. Simply walk over and pick up one of the skulls to place it in your inventory. The Skull appears briefly in the top left of the screen before permanently being shown on the right hand side of your inventory panel. Take note of the Apothicon symbol that is associated with that skull. These vary depending on the skull you pick up and you can even swap out the skull for a different one and come back to it later. The important part is that there are four skulls which means four tasks in total.

2. Place skull at corresponding altar. Take the skull from the ritual altar and place it on top of one of the four altars that has the same matching Apothicon symbols on it. These altars are located in different areas of the map (see list below for locations). Once placed the skull floats and turns a blue color. Now, protect the skull while new zombies spawn in and after enough time has passed the skull will stop glowing and an audio cue is heard to indicate that you have collected enough souls. Now pick up the skull again. For your reference, each of the four altars are found in the locations listed below:
• By spawn
• Behind bunker in the docks area
• Plane wreckage near Lab A (propeller trap area)
• Lower floor at the back of the Communications Center (test subject room)
If you fail to defend the skull then it will disappear and return to the original altar.

3. Place the skull at the ritual site again. Head to the ritual site again and place the skull back on the altar in the middle of the ritual site. The skull should glow blue to signify that this skull has been completed.

4. Repeat for the remaining skulls (x 3). Simply repeat the process above for each of the remaining skulls:
• Pick up skull
• Remember symbols
• Locate altar
• Place skull
• Defend
• Return skull

5. Collect the Skull of Nan Sapwe. As soon as you place the fourth and final skull onto the altar, it will crumble away, revealing a secret underground area. You're almost done at this point so rush over to the middle of the room and interact with the Skull. Keepers will spawn in through portals so use your best firepower to quickly brush them aside and help to fill the Skull of Nan Sapwe in the center of the room. After enough souls have been collected the new weapon is yours to pick up and keep. Enjoy!