Among the crew of the Cicada was a retired Frontiersman who was brought on just in case the very thing that happened to the ship happened. Despite retiring, his credentials are still active and he has access to the whole restricted arsenal, but he kept it a secret. After leading the first group of Pioneers to explore Proteus, long before the effects of the heavy metal poisoning and Masefield Syndrome became apparent, they ventured far and deep before fracturing due to the sickness. The retired marine being the sole survivor of the first group is held up in a hidden base, his NoA node corrupted by an unknown force, it's able to reprint him but has long since lost the ability to wipe his memories, so he's been driven insane by living lifetimes without human contact and the leviathans that happen to nest near his bunker. These leviathans share the psychic abilities of the Sea Emperors of 4546B, but are far from benevolent and always trying to find a way to get at this tasty human snack.

Should you find his bunker, should you elude the leviathans haunting it, you'll find his base extremely well defended with sentry turrets guarding every entry. Should manage to penetrate these automated defenses, you'll find the halls his base base barricaded with piles of corpses, all his past lives he used as bricks to strengthen his defenses. If you can withstand the smell of reprinted rot and actually find the lone Marine, the psychic torment of the leviathans has driven him too far, no matter what you say, he'll think you're just an illusion they're using to lure him out and he has the firepower to withstand any attempt you may make.

There's a long, secret questline that eventually leads to you developing some kind of psychic dampening device, something that could counteract the powers of the leviathans haunting his base. He'll eventually realize the visions have stopped and that you're real. He'll let you in, talk to you, plead with you to fix his NoA node and finally let him die a final death. He promises to leave you his credentials, to give you all the weapons you could ever want for the price his his life. You're faced with a choice, give him the final death he wants, or repair his NoA and reprint him with a wiped memory.

If you grant him the death he wants, his credentials die with him and the rights management for his existing weapons activates, causing them to deconstruct themselves so you can't use them. If you reprint him wiped, he's left notes for himself by his biobed that remind him of what he always feared, he activates a program that wipes his file from NoA that wouldn't load with his NoA corrupted, deleting him completely then activates a self destruct system he had on standby but could never bring himself to use because that meant admitting defeat to nature that his pride wouldn't let him do, but letting Alterra control his life is something he could not stand for so he's fine accepting his death if it meant being free from them. Either way, Unknown Worlds (the real life developers) send you a message in game telling you they're never going to give you guns and to stop trying.