Luciel poured enough plant energy into Thorn, focusing most of it on the blood that the cactus had just absorbed.
He concentrated his plant energy on the absorbed blood until he felt that he had finally established a link with Thorn.
The blood filled with his plant energy inside Thorn became the core of their link.
After his death, that blood would automatically dissipate, but as long as they remained linked, the drop of his blood would stay within Thorn and act as a medium that strengthened their connection.
Because Thorn had been receiving his plant energy for a long time, it had already grown accustomed to it and showed no rejection when he poured in more energy. As a result, their link was established easily without any problems.
For plants that hadn't been receiving his plant energy over time, it would normally take longer before the link could be successfully established.
