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.
If the user has one or two fusion cores in the inventory, Aeternus will fire off 1 or 2 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 ones inventory.
- pc ps4 xboxone 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]
- pc Used cores randomly deplete to under 10 power then switch to a new core. As the ammo counter shows how many cores you have this is misleading as you think you have infinite, until you see all your cores have from 3-9 uses left. [verified]
This article is too short to provide more than rudimentary information about the subject. You can help Nukapedia by expanding it.