How do hidden caves break the ice?

The hidden cave was opened by the blood jade left by Yin Tianchou. According to relevant public information, Tong Bo left Doudou to save the snow, but Yin Zhong took advantage of it and tried to take away the essence of Doudou. Tong Bo got back in time, and Pearl sacrificed herself to let everyone enter the hidden cave smoothly, leaving a piece of blood jade that Qiu Tian gave her before she died. When they returned to the hidden cave, Yin knew that the patriarch's successor was not Tong Bo, but without the joint efforts of six frozen elders, they could not cast spells on the spirit mirror. Yin Zhong took the mirror and tried to find another way. Tong Bo and Zhan Tong chased after him, and the blood jade left by Qiu Tian fell to the ground, actually dissolving the ice. Everyone knows that this jade is the only "heart of blood" that Yin Zhong has been looking for for for many years.