The wafer, according to the Journal, had allegedly been stolen from the Catholic Church.
Lawyers for the archbishop, Paul Coakley, filed a lawsuit on Wednesday demanding for the return of the wafer from the group of devil-worshippers, called Dakhma of Angra Mainyu.
The lawsuit followed the Satanic group saying that it planned to perform a "carnal sacrifice" at a "Black Mass" ceremony in the city's Civic Center Music Hall in September.
A lawyer for the Satanic group said that once the lawsuit was dropped they could have the wafer back.
"Once the Catholic Church has dropped the lawsuit, they can collect it from my attorney," the attorney, Adam Daniels, told the Journal. "I don't feel like wasting thousands of dollars fighting over a cookie."
Read the lawsuit, via the Journal, here.