Another method is for Yan Fei to connect with the Dreamland Cave World, using energy to open a temporary passageway between the Dreamland Cave World and this location. Yan Fei could then enter the Dreamland Cave World through this temporary passageway and instantly return to Dream Island via another passageway within the Dreamland Cave World. The second method is the most convenient and fastest, but it would severely deplete the energy of the Dreamland Cave World.
Unless faced with a true life-and-death crisis, Yan Fei would never excessively consume the energy of the Dreamland Cave World. This energy is crucial to the stability and safety of the Dreamland Cave World. If energy were to run out, the Dreamland Cave World might collapse or disintegrate. The Dreamland Cave World has become Yan Fei's primary reliance in his endeavors, so a collapse is a consequence he absolutely cannot afford to witness.
