Talion

The  is the key to opening the Temple of Xian in China.

After the battle with Dragon Emperor in his dragon form, the monks from Tibet retrieved the Dagger of Xian from where the Emperor was killed. They entered the Temple of Xian and placed the Dagger of Xian back into its pedestal. The door was locked with the Talion, and after this the monks took the Talion and hid it deep within the Barkhang Monastery to be protected by the Guardian of the Talion.

In 1997, Lara Croft took the Talion and killed its Guardian. She then used it to open the Temple of Xian so she could recover the Dagger.