At this altitude, Su Ping applied a First Tier top-grade Concealing Talisman and an Illusion Talisman.
Unless someone below had activated a god-like perspective and knew beforehand about the flying object high in the sky,
even a Foundation Establishment Cultivator wouldn't notice the presence of this weather balloon at such a height.
After all, the Divine Sense of a Foundation Establishment typically spans a few hundred meters, maybe stretching to a maximum of a kilometer at the limit.
Meanwhile, the typical altitude for an Immortal Boat is around three to five thousand meters, with very few flying up to ten thousand meters.
For them, a height above sixteen thousand meters isn't unreachable, but there is no need to expend that much mana.
Moreover, since the weather balloon itself didn't fluctuate with mana nor did it disturb the spiritual energy,
