Agate Prison serves as the Queendom's largest high-security prison. It was formerly controlled by the House of Godwin and in its time has held a number of prisoners, though it is questionable how many of these prisoners were actually dangerous or just political enemies of the Godwins. It is not the only prison in Falena however, as prisoners are often moved to and from Agate as needed. Following the Queendom's victory over the New Armes Kingdom, noted strategist Lucretia Merces was imprisoned in Agate Prison. During her time here she instructed her two prison guards Cius and Lelei in battle tactics.