[fumbled her way through? now that's not an expected response, evidenced by how he quirks a brow. that oddity is what leads to an honest response to tifa's question, if a response that still does omit some details.]

This place is the Holy City of Welgaia. Only certain individuals can access it to begin with through a specific entrance. The chamber we're presently in is restricted access to even most of the city's inhabitants.