The existence of the substance has been a sacred secret of the Castaka's for many generations.

"The location of the stronghold is a sacred secret," Nadhari whispered.

These people had protected him, trained him, introduced him to their most sacred secrets.

The peers who had remained within earshot stiffened in horror at the prospect of this rough intruder revealing their most sacred secrets.

There was a human before her, casually spouting sacred secrets.

Prior to this time, even this record has been kept as the sacred secret of the Ancestors.

The truth will out, I can no longer conceal it here is the man who told me all the sacred secrets.

You talk of his big plans as if it's some kind of sacred secret, but the fact is that everyone knows it.

What action would they take in order to prevent the sacred secret from falling into the enemy's hands in spite of the latter's fighting superiority?