See more: Summary of Assassin's Creed's Origin Mission Raiders
Step 1. Go back to the library found in "Chapter III-18: Workers' Funeral" (the entrance is the well in Letopolis), and investigate a scroll called "The History of Old Librarians" to perform this task.
The article mentions the swamp city and the spear, which means that you can get a good weapon to complete this task.
Step two. According to the guidance, Bajk came to the bird's eye view of the east bank of the Nile (no bandits were killed in the ruins), and Bajk met a historian who wrote "I have seen Toth", which mentioned the place where Mesh fought and died in the hands of eunuch Bagouus and Rhode Island mentor. Legend has it that the "Sword of Buta" is the sacred object of Sehmet and Sekate. According to historians' inference, it should be hidden in the place where the bandits in the north are stationed.
Step three. Under the guidance of historians, Bajk came to Dassault's hiding place.
Let Sanou mark the position of the sword of Buta first.
When exploring Dassault's hiding place, you don't need to provoke bandits, just jump into the ground from the pit and kill the hounds there, and you can find the Sword of Buta (18 grade, purple).
Get this sword and you can finish the task.
Assassin's Creed: Origin