It wasn't long after the human was adopted that something interesting happened. Remember how the way to integrate weapons into a monster's Magic was to carve runes into them? And how runes are essentially the DNA of Magic...? Well...

Greatest Dog and Dogera had both gotten weapons from me, and Greatest Dog some Magic armor. And, recently, they had a litter of puppies.

I was working on the fourth floor of the lab. The design for the first CORE prototype were taking shape- I was still convinced at the time that this wouldn't be longer than a ten-year project.

Suddenly, Greatest Dog and Dogera burst in, each carrying a pair of puppies. Their wild yapping startled me, and, had I not had the extra hands summonable, I very well might have dropped my coffee on the CORE designs.

As it was, I managed to catch my mug and most of the coffee.

Then I turned to the dogs. "Whatever are you doing? I admonished. "Bursting in so suddenly..."

"Sorry, Dr. Gaster, Sir!" Dogera barked. "But we have something you're gonna want to see."

"Oh?" To avoid further mishap, I set my mug of coffee on the table. Dogs tended to be already a bit wild, and if whatever they wanted to show me was unusual enough for them to come running, then it had to be pretty strange indeed. "What is it?"

Dogera nodded to Greatest Dog, who set the puppies he was carrying down on the floor with a small yip.

For a moment, the puppies looked incredibly nervous, but with a bit of encouragement from their parents, they both perked up a little.

And then, after a moment, they both summoned weapons. One a spear, and the other a sword.

For a moment, I just looked at them. Then I knelt down and carefully reached out to run my fingers along the flat of the one puppy's sword. It burned a little, but the puppy wasn't particularly strong enough to actually do damage.

After a couple moments examining the sword, I turned to look at the spear. Then I stood up, one hand rising absentmindedly to my jaw as I still looked down at the weapons.

"It's definitely my work..." I murmured, turning to Dogera. "But I've never met these two, much less made weapons for them. Can those two do it too?"

She shook her head.

"Hm. That's... very interesting. I'll have to do some research. Can you come back tomorrow, and bring them with you?"

"Yes."

"Good."

Over the next several months, I did an extraordinary amount of research on my own previous work. In those three months, a few more monster couples, at least one of each pair having been given a weapon, brought their child in after said child summoned a weapon.

Eventually, I did figure it out. Like I've said, runes are the DNA of Magic. So when I was giving people these weapons by carving out runes into them, I was literally adding to their genetic code. And from there, the "genes" for the weapons were just as likely to be passed from parent to offspring as any other genes.

The way I saw it, this was a good thing. It meant that when the Barrier was finally brought down and the war with the humans reengaged, I would have less work to do to get monsters into fighting shape.

Asgore did not see it the same way.

"Gaster, we are in a peacetime now. We have even taken in a human. We do not need weapons!"

"Oh, I'm sorry!" I retorted. "Let me just go back fifty-something years to when you asked me to give people weapons in the middle of a war so they could fight for their lives and freedom, and say no because my hard work will continue to be put to use by future generations! I didn't know this would happen, Asgore, and even if I did, I still would have done it!"

"Can't you take the weapons back?"

I made an irritated sound. "I could, but that would mean months of work. And besides, it's not like they're doing any harm, anyway."

"Gaster! They are weapons! Weapons are dangerous! Our own children could accidentally kill each other!"

"They could do that anyway with their normal Magic!"

"Gaster-"

"Y'know, I have a better idea. Why not, instead of putting all the blame and responsibility on me, we actually teach the kids to use the things responsibly. That way, they won't slaughter each other as you seem to think they're prone to doing, and they'll still have them if they need them."

That was the end of that discussion.

As for the weapons, with my... absence from time and space, it would appear that everyone thinks monsters have simply always had the weapons, passed down through family since the beginning of time, almost as inheritance.

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A/N

I realized something kinda funny. When I type the little outro thing below, I still habitually type the old one and have to correct myself. You'd think that by now I would have gotten used to saying

Anyway, thanks for reading, and I hope you enjoyed it! Comments and votes are my Favorite Things, and every notification I get makes my day!