Serpent of Serapis

The Serpent of Serapis was a spear forged by a blacksmith from Sais. Said to be his greatest creation, it was high revered by many soldiers and warriors within Sais, including the Medjay, Bayek in 48 BCE.

When Bayek visited the blacksmith in Sau Village, the blacksmith directed him to several of Sefetu's soldiers, who had stolen the spear and travelled on a trireme around Lake Mareotis. Bayek later eliminated the bandits aboard the vessel and claimed the spear for himself.

Reference

 * Assassin's Creed: Origins