The crystal’s name was “Last Loyalty,” an evil tool to self-destruct just like the Demon Race woman said. Someone with high position in the Kingdom and Church of the Saints naturally carried important information with him. And because there’s magic capable of reading one’s memory in dark attributed magic, that person would be forced to carry the crystal when he went to the frontline. It would be used in time of emergence so the memory could not be read, along with the intention of involving the enemy with the self-destruction.