All the monsters of the Underground gathered, having heard that the barrier was finally down. Some weren't entirely certain they believed, despite their own power being part of what had made it happen. However, Woona's actions throughout the land had given everyone hope, and this new hope was one they were more than happy to seize hold of with all their strength.
Seeing the path clear, the twilight of the barrier no longer present, many were eager to surge forward, but Asgore held them back with a wave of his hand, ensuring that this exodus was organized and controlled. After all, another people awaited them in the outside world, and they all needed to put their best foot - or foot equivalent, for those who didn't have feet - forward as they made their way out. With stately march, they made their way through the small cavern, marveling at the sight of the crystal tree that stood at the very edge of the space once contained by the barrier, as an eternal guardian of the Underground.
The vast majority of the monsters went with their leaders, not wanting to be held back at all. Eventually, only three figures were left beneath the boughs of the tree. Woona turned to glance up at Chara. "Aren'tcha gonna come?" she asked worriedly, grabbing his hand and trying to tug him along.
Chara shook his head softly. "No, Woona," Chara replied softly. "The world up there at the other end of the cave...it's a world without humans. With all the evil humans wrought in their world...I don't want to contaminate that with my presence. Better this world build itself free of the example of my knowledge and memories."
"B...but..." Woona whimpered softly.
"I'll still be right here," Chara explained calmly, leaning against the tree. "I'm not the only thing to have crawled its way out of the void, after all. There are things worse than me down there still...and without the barrier, there's nothing to prevent them from escaping to the surface." He stared back into the darkness. "Nothing except me. I've stared into the Abyss...I won't let it swallow up those I care for again."
Woona whined deep in her throat. "But...but you'll be all alone..."
"I'm used to being alone," Chara countered. "And I know you'll all be stopping by to visit at every opportunity, so I'll hardly have a chance to get lonely."
"Besides," Red added as she stepped up, a box held in her arms, "he won't be alone. I've stood guard over the edge of the Void for my entire career in the Guard. I'm not about to abandon my post." She held out the box to Chara. "You'll need to be properly armed, though."
Curious, Chara reached into the box and withdrew the Worn Dagger, which in his hand extended a mystical aura in the shape of a full size sword. He lowered his eyes and chuckled as he slipped the weapon into his inventory, a skill he'd long developed before he died. "I guess I do, at that. Only fitting, I suppose...that makes me the last King of the Humans, doesn't it?"
"If that's what you want, Your Majesty," Red offered playfully.
Chara rolled his eyes, then turned to Woona. "Tell our folks I'm okay, alright?" he asked softly. "I...I wouldn't do well back on the surface again, not yet. And..." He sighed sadly. "Keep an eye on Asriel for me, okay?"
Woona smiled happily, a tinge of a blush on her cheeks. "Okay," she offered happily. "I'll take care of the cutie!" With that she bounced away.
Chara, for his part, groaned. Apparently, his own deep affection and regard for his brother had imprinted itself in Woona's mind and soul from long sharing a body...in an unexpected way. After a bit of thought, though, he couldn't help but chuckle. Asriel, good luck with this...
Woona quickly caught up with the others, who had reached the edge of the cave and climbed their way to the top of a cliff, staring upward at the sun rising from behind a distant tall mountain. All were silent as they marveled at the beauty of the sunrise. Woona couldn't help but giggle as she saw their expressions. "Big sis did good today!" she offered happily.
"Big Sis?" everyone except Sans asked, stunned.
"Yup!" Woona replied happily. "She makes the sun go up and down. When I'm bigger, it'll be my job to do the same with the moon!"
"Magic controlling the heavens?" Toriel gasped out, stunned. "Goodness, there's so much I'll have to relearn about the surface now."
"I g-g-guess that explains why your soul is so strong," Alphys stammered out. "The amount of magic it'd take to move a celestial body...I s-shudder to even comprehend..."
"Well, we're not going to make a good impression just hanging out here!" Undyne proclaimed. "Let's go!" Laughing madly, she charged towards the mountain.
"Undyne, wait!" Asgore called out worriedly, racing after her.
"I WILL GET THERE FIRST!" Papyrus proclaimed, taking to his heels. "NYEHEHEHEHEHE!"
"this is going to be interesting," Sans chuckled as he calmly walked off in seemingly the wrong direction.
Woona and Asriel giggled together as the other monsters followed. Toriel smiled down at them. "Let's go, my children," she offered softly, holding out her hands. As they took them, she glanced around. "Where is Chara?"
"He feels he has a job to do," Woona and Asriel said at the same time.
Woona turned away from the cave to glance at Asriel in shock. "How did you-?"
Asriel chuckled. "I know him better than anyone, Woona," he explained softly. "I know how he thinks."
Toriel chuckled softly. "Well, I won't begrudge him the responsibilities he chooses for himself. After all, it seems it's now Woona's job to be ambassador between monsters and ponies."
Giggling happily, Woona walked with her Mommy and brother, to meet up with her sister at long last.