The Talisman of Charlemagne is an amulet with a True Cross and the supposed hair of Mary between the two large sapphires. It once belonged to the King of the Franks, Charles I or Charlemagne.
"Also known as Charlemagne's talisman, it is said to make its owner an emperor. In between the two gems is a piece of Jesus' cross and a hair of the Virgin Mary."
—Persona 5 background
Emperor's Amulet is the fifth Persona of the Hanged Man Arcana and can be found in Shido's Palace and in the Sheriruth area of Mementos, from floors 7 to 13, but only after clearing Shido's Palace. It is the only Treasure Demon with a title as a Shadow, being called the "Emperor's Talisman" before it is captured. Emperor's Amulet is the first Persona with access to the heavy single-target elemental and force skills, but as it cannot be used in battle, these must be applied to other Personas through fusion. When itemized using Electric Chair execution in the Velvet Room, Emperor's Amulet yields the Emperor's Amulet accessory, which increases the wearer's Endurance by 5 and grants them the Attack Master ability.
Persona 5 Royal[]
"Also known as Charlemagne's talisman, it is said to make its owner an emperor. In between the two gems is a piece of Jesus' cross and a hair of the Virgin Mary."
—Persona 5 Royal background
Emperor's Amulet is the fifth Persona of the Hanged Man Arcana and can be found in Shido's Palace and in the Sheriruth area of Mementos, from floors 7 to 13 (after clearing Shido's Palace). It is strong against Physical and Gun skills, but has a weakness to Electricity skills. When itemized using Electric Chair execution in the Velvet Room, Emperor's Amulet yields the Emperor's Charm accessory, which increases the wearer's Endurance by 5 and grants the wearer the Auto-Matarupassive skill. Furthermore, if itemized while the fusion alarm is sounding, Emperor's Amulet grants the Emperor's Charm R accessory, a slightly stronger version that, while retaining the Auto-Mataru skill, increases the wearer's Endurance by 8.