Who of the adults remember the war? Is it just Toriel, Asgore, and Gaster? What was it like before?
"It's not just them." Grillby answered, signing "I was a child at the time, but i remember it clearly. My father was a general alongside Gaster, and after his death, Gaster and Toriel set up the orphanages i grew up in." He looked off with a distant expression, "They captured every wood elemental except for myself and dragged them off to a lake. The only reason they didn't catch me was because my father gave me his cape to hide under. Toriel found me a few hours afterwards. We lost the war two days later."
"Riverperson remembers it too." Gaster stated, "but they stayed underground after the barrier was broken. They prefer the darkness, so you wouldn't get many answers out of them."
"Gerson remembered it, as much as he remembered anything, but he died a few years ago. Tortoise monsters may be long-living, but they aren't immortal. Undyne went on a distraught rampage through the mountain's forests for a day or two after the funeral. I think she's come to terms with it now."
"As for what it was like," Gaster continued, "It was peaceful. Humans and monsters had co-existed for many, many centuries before the war, though skeletons didn't co-exist with either until about a century before. Which, in skeletal lifespan, is only about half our lifespan. Myself and my brothers were considered the first generation of skeletons to be born amongst humans and monsters. I'm just glad my sons were the only generation to be born underground."
"We had human friends when we were young- myself and Asgore, that is. One in particular was a perseverance soul called Percy. Creative, i know. I believe he was sentenced to death after trying to warn us about a human invasion in the last few days of the war, though. He was the understudy for the Perseverance mage that sealed us away, but he was a good man. I hope his bloodline continued after his death."