The two elders of the Yan family struck together, and the Spiritual Power on their bodies was incredibly similar, suggesting they practiced the same Cultivation Technique.
Gathering Spiritual Power, their combined attack was a Cooperative Attack Skill.
The Cooperative Attack Skill is said to be a move that can only be practiced between brothers with the same heart and mind, it is difficult to train.
Yet these two elders of the Yan family had cultivated the Cooperative Attack Skill to near Great Success.
When the two acted together, gathering Spiritual Power, it was like a Martial Artist attacking, but this Martial Artist had the power of two Nine Tribulations Ancient Emperors.
This was much stronger than the power unleashed by two Nine Tribulations Ancient Emperors, even three or four combined might not be a match for the two Yan family elders joining forces.
"The Cooperative Attack Skill, it certainly has some merits!"
There was a hint of seriousness in Chu Fengmian's eyes.
