"DIE!"
Suddenly Frisk was surrounded by more of those magical 'friendliness' pellets.
"Awww that's adorable, it thinks it's a threat!" Frisk said in a cheerful voice.
Suddenly Flowey is grasped in a telekinetic grip far worse than it ever felt when fighting Sans, and is casually dropped off to the side, where it sits, trembling, images of a death's head in its mind.
Frisk then goes on through the underground, using liberal amounts of Telekinesis and magical awareness to 'Pacifist' their way through the Underground, and when they reach the barrier, they scoff, and break it with barely any effort, saying how the previous seven mages must've been hacks and that the barrier sucks, but it's really just that Frisk is that stupidly powerful.
Meanwhile King Fluffybuns is stuck in the air in a telekinetic grip, trembling and white faced until Frisk is long out of sight. Only then does the field drop, incidentally dropping everyone that attacked who were also still in that grip till then. Everyone shows up to find the king stunned and faintly saying once he realizes they're there, "Perhaps we shouldn't try to fight the humans."
Everyone nods, still a bit shellshocked, even a certain flower in the background.
The End