The monolith is a massive block of stone acquired by Beech Hill Museum for their Maya exhibit in 2002 after it was recently excavated in a cave near Palenque.
While translating the glyphs on it, Henrik van der Hune realized that it was the prison of The Whisperer, the woman he had heard about from a shaman 30 years earlier.
A curse upon you who beholds this terror
The evil deeds of the Whisperer of Silent Secrets remain undead
Within this prison of stone
Broken only when the four corners of the world are bound together
When the first king ascends the throne again
When the last Copan fool has labored til the end of time
King Pacal had hidden the six keys to the monolith around the western world. Henrik tried to get all of the jade keys to the monolith to protect the Whisperer's writings from being sold on the black market, but Taylor Sinclair was beating him to it.