Aeternus

Aeternus is a unique weapon in the Fallout 4 add-on Nuka-World.

Characteristics
Aeternus is a unique Gatling laser that bears the "Neverending" legendary effect.

Although it uses the "Neverending" effect, its actual effect gives the weapon true unlimited ammo. It will use a portion of a fusion core when first fired, but the core's charge will not decrease again while using Aeternus.

Variants

 * Gatling laser
 * Final Judgment

Location
Go to Nuka-Town USA to activate the Amoral Combat quest, then you must talk to Fritsch in the Nuka-Cade and tell him you want to fight in the arena. After that, you must go to the Cola-cars arena and go inside the arena to face a challenger. Once the challenger is defeated, the quest is completed. However, you must repeat this quest and face a challenger called the Rogue knight. Each time you repeat this quest the challenger will be random, repeat and complete this quest as many times as you can until you face the Rogue knight. To repeat this quest, you must fast travel to Safari Adventure primate house, once you enter the building, go to the right and over the corner there will be a bed, sleep on the bed for 24 hours, after those 24 hours, go back to Nuka-Town USA and the Amoral Combat quest will reappear. The process of the whole quest will be the same. Once you finally face the Rogue knight you must kill him. The Rogue knight will be using Aeternus. Upon the defeat of the Rogue knight, his corpse will NOT have Aeternus in his inventory, instead, he will drop it, you must search around the area of the arena where you killed the Rogue Knight and find Aeternus. The weapon will be laying on the ground.

Behind the scenes
The weapon's name is from the Latin language, meaning "eternal" or "immortal."

Bugs

 * Consumes 33% of a fusion core on the first shot, then nothing for the rest of its use. If the gun is put away or switched, it has a new fusion core automatically inserted which takes another 33% of the cores charge on its first shot. This can leave a regular user with a large stack of fusion cores with only 67% charge. Once the player is out of full-charge fusion cores the gun will automatically load the partially depleted cores, which will then fully deplete the fusion cores, though they still function in the gun.
 * To fix this, keep all but one fusion core stashed on a companion or in a container.
 * It seems to be irregular in consuming ammo. Sometimes draining a fusion core entirely in the first shots, or firing only as many shots as the player has fusion cores and then removing one core entirely.
 * Used cores randomly deplete to under 10 power then switch to a new core. As the ammo counter shows how many cores one has this is misleading as it gives the appearance of having infinite cores, until one sees all their cores have anywhere from 3-9 uses left.
 * After killing the rogue knight, it is possible they drop a random legendary item. This can be avoided by forcing the rogue knight to exit power armor, pacify then fire at them, they will now be using the weapon, however it may not be legendary.

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