Strange, blue, glowing symbols branded on the heroes' arms in the Forgotten Realms
game Curse of the Azure Bonds, which is part of the Advanced Dungeons and Dragons
computer game family.
Each bond is placed on your arm by a certain mysterious organization wishing to control you in various ways. The bonds sometimes force you to commit acts you would never otherwise consider, such as attacking the royal carriage!
As you defeat the ring leaders of the organizations which cursed you with the sigils, they vanish from your arm. To complete the game, you must progress through and remove all the sigils from your heroes' arms.