In 1747, Salah and his fellow Assassins attacked Nāder Shāh. Although the Shāh was able to kill two of Salah's brothers, Salah was able to assassinate him with a sword. However, the Koh-i-Noor in the Shāh's possession was discovered to have ended up in the hands of Ahmad Shāh Durrānī, an Afghan chief. Salah thus planned to pursue him in order to acquire the Piece of Eden.
Following the assassination of Nāder Shāh, Salah wrote a letter to Achilles Davenport, the Mentor of the Colonial Assassins, detailing the events. Although he expressed that he was glad to have allies in his Brotherhood, Salah also mentioned that he regretted not having the time to be better acquainted with Achilles and his cause.