"I mean, what's the point of having an ancient, spooky temple if it doesn't have a hidden dungeon?" Frisk says, cracking a smile, but secretly they're rather worried that they might be wasting time on a dead end . They had less than half a year before Bahamut showed up to wreck Vaikuntha, they did not have any time to waste on false leads.

Ignoring their doubts, Frisk wanders into one of the "side rooms," snapping their fingers and summoning a flame kunai to peer at what little wall is left. Mysterious ruins always had clues on their walls, right?