In Assassin's Creed Odyssey, what is the name of the playable protagonist's family spear?

In Assassin's Creed Odyssey, the playable protagonist's family weapon is the Spear of Leonidas. It is a broken spearhead inherited from Leonidas I, the Spartan king and the protagonist's maternal grandfather.

The spear is not used as an ordinary full-length weapon. Its fragment grants the protagonist special abilities and is upgraded throughout the story with materials called Adrestia fragments. The weapon also serves as a narrative link between the protagonist's family and the ancient First Civilization.

Odyssey allows the player to choose either Kassandra or Alexios as the playable character, but both choices use the same family artifact. This is why the answer is the spear's name rather than one character's personal weapon. The ship Adrestia and the Staff of Hermes are separate important objects in the game.