Although it uses the "Never ending" 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.
- Gatling laser - The common variant found throughout the Commonwealth.
- Final Judgment - wielded by Elder Maxson.
When firing the Aeternus with a fresh fusion core, the shown ammo will always become 1 less than all the fusion cores in the player character's inventory. The remaining charge of the active fusion core is not equivalent to this number. If the maximum number of fusion cores in the player character's inventory is 1, the ammunition in the clip will become 0, causing the fusion core to deplete and vanish. As such, the Aeternus is nearly completely useless if one has only 1 fusion core in their inventory. Additionally, if the amount of fusion cores in one's inventory increases while the Aeternus is out, the current fusion core will instantly be consumed and the gun's ammo will become equal to the remaining fusion cores in one's inventory, then decrease by 1 when firing the Aeternus again.
Behind the scenes
The weapon's name is from the Latin language, meaning "eternal" or "immortal."
- [verification overdue] When the player character is wearing power armor there is a chance it will function like a regular Gatling laser
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.[verified]
- 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. [verified]
- 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. [verified]
- After killing the rogue knight, it is possible they drop a random legendary item. [verified] 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.
- If the user has one or two fusion cores in their inventory, Aeternus will fire off one or two rounds before fully depleting the cores. If one has at least three fusion cores, the fresh loaded weapon will use a seemingly random portion of one fusion core before reaching "unlimited ammunition." This is valid up until one loads a new fusion core either by equipping another weapon, modifying the Aeternus in a weapons workbench, or increasing the amount of fusion cores in one's inventory.[verification overdue]