A stone tablet tens of thousands of years old found beneath the ruins of B'hala, which held a Prophet and a Pah-wraith until Sisko shattered it.
The tablet is discovered in the Deep Space Nine episode The Reckoning. Bajoran archaeologists working under the lost city of B'hala find a slab whose inscription greets the Emissary, and Sisko, after a vision from the Prophets on touching it, takes it to the station for translation, to the annoyance of Kai Winn.
Storms and tremors strike Bajor while Dax works on the text, which speaks of a reckoning. Acting on impulse, Sisko smashes the stone on the Promenade, and two streams of energy escape. A Prophet enters Kira Nerys, and the Pah-wraith Kosst Amojan takes Jake Sisko.
The two face each other in a battle that prophecy says will begin Bajor's golden age if evil is defeated. Sisko lets it proceed, but Winn floods the Promenade with chroniton radiation and drives both beings out.