For other cultivators attempting to reach the Foundation Establishment, this step could be incredibly challenging.
The spirit power within their bodies is actually quite vast for a cultivator at the Qi Refining great perfection.
Normally, controlling the spirit power within the body to cycle and absorb spirit Qi to transform it into their own spirit power is entirely different from the experience of gathering all their available spirit power to the Elixir Field.
The former just requires urging the spirit power to move along the meridians and keep cycling.
While the latter needs to manipulate every strand of spirit power that can be controlled in the body and bring them all into the Elixir Field.
The workload between these two is utterly dissimilar.
One follows the natural course.
The other needs absolute precision.