Teleportation consumed energy, and the amount depended on two factors.
Distance and mass.
The greater the distance and the larger the mass, the more energy it consumed; conversely, the less.
Take Lu Ye himself. Now that he was in the Divine Sea Realm, the Spiritual Power he needed to expend to activate a Teleportation Spirit Array was undoubtedly many times greater than when he had been in the Cloud River Realm.
In terms of mass, his cultivation had risen from the Cloud River Realm to the Divine Sea Realm. Growth in strength was also a change in mass, so the power consumed naturally could not be mentioned in the same breath.
The distance from Nine Provinces to the Blood Refining World was unimaginably vast, so the energy required for teleportation had to be enormous. That was also why Dao Thirteen had been left behind when Lu Ye returned to Nine Provinces last time—it had been to conserve energy.
Back then, he, Ying Wuji, and eight others had been transported by the Nine Provinces Heavenly Mechanism to the shattered Peerless Continent. But at the time, Peerless Continent must not have been too far from Nine Provinces, because not long after they resolved its troubles, the shattered Peerless Continent merged with the Cloud River Battlefield and became part of it.
Moreover, they had all been Cloud River Realm cultivators then. Their mass had not been great, so the expenditure naturally had not been too large. That was why Heavenly Mechanism could send them over so easily.
But if Lu Ye wanted to bring reinforcements to the Blood Refining World this time, they would have to be Divine Sea Realm cultivators, and the higher their cultivation, the better. The expenditure required would be impossible to calculate.
It would be a waste of effort