Chun Yeowun absorbed the power of the Great Bird, which was inside the staff, after taking in the Dragon Turtle’s core.

As it hadn’t been touched for hundreds of years, there was no loss of energy inside the staff, however, the cold qi inside Chun Yeowun was in harmony with the power of the Great Bird.

After absorbing all the spiritual energy, the staff was able to disintegrate and transform into a type of armor.