Golden Light Incantation

"金光咒" (Golden Light Incantation), also known as "金光神咒" (Golden Light Sacred Incantation), is a chant commonly used in the rites of Taoism. It's believed to have the power to drive away evil spirits and protect a place or a person from misfortune.

What Xiao-Bai saw in the Dungeon was a variant of the real Golden Light Incantation. Here was the scriptures written on the plaque:

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'''天地玄宗，万炁本根. '''

The Heaven and Earth is the fundament and origin of Taoism, Everythings in this world are from the same source (which is Tao).

'''广修亿劫，证吾神通. '''

(We shall) Practice our way through hundred millions of trails, to prove our powerful and sacred belief.

'''鬼妖丧胆，精怪亡形. '''

Ghosts and demons shall be terrorized, Spirits and monsters shall be disintegrated (before our belief).

捉妖除魔，灭形灭神.

(We shall) Slay monsters and extinguish demons, destory their bodies and shatter their souls.

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However, only the first three sentences (marked by bold) are from the Golden Light Incantation, the last one is made up by movie. It seems that the plaque with Golden Light Incantation was used for imprisoning the dead demion (the huge skeleton with wings) in the chamber. And as a demon, Xiao-Bai was naturally afraid of those scriptures.