Players need to find 3 Antediluvian Chisels to upgrade the Umbral Lamp to its max. To do so, you can find the chisels in the Umbral in the following locations

• Calrath City - By a fountain near the Calrath Slums - Alehouse Vestige
• Fief - Inside the cave you fight the Guardian Boss before the Fief vestige.
• Manse of Hallowed Saints - In the castle grounds.