After a few more minutes, Fang Zhou suddenly felt an unprecedented resonance.
The Black Magic Bottle had reacted!
Fang Zhou took a deep breath and continued to guide the Undead Attribute Energy, allowing that power to merge more smoothly with the Black Magic Bottle.
However, the gray light emitted by the Black Magic Bottle flickered unsteadily. It showed a slow upward trend but never reached the critical threshold.
Despite consuming a large amount of Spiritual Power to guide the Undead Attribute Energy from the environment, not a trace of the gray smoke Yue Pengfei had mentioned appeared.
Finally, after several attempts, Fang Zhou discovered an important characteristic of the Black Magic Bottle.
It could absorb and store Undead Attribute Energy, then produce gray light and even gray smoke through an internal reaction mechanism.
Only when the Undead Attribute Energy, both external and internal, reached a certain threshold would it release the mysterious gray smoke.
