The first spear upgrade only requires one artifact. If you need any other help with the game, check out our Assassin’s Creed Odyssey guide wiki over here. From then on, upgrading Leonidas's spear is a side goal that will make you more powerful.

The more it is reinforced at the ancient forge on the island of Andros, the more necessary it becomes to find even more artifact fragments. Once you’ve got fragments in your possession you can head to the Ancient Forge on the Island of Andros to upgrade the spear. Assassin’s Creed Odyssey guide to cultists and upgrading your spear. Upgrade the Spear, quest walkthrough and hints. To upgrade the Spear of Leonidas, you must defeat these cult members and then collect the Artifact Fragments that they possess.

To upgrade your spear, you’ll need to find artifact fragments. Where can you find these items? To be able to improve the spear and strengthen it as much as possible, you will need to obtain a certain number of artifact fragments. Sadly, you won’t randomly come across them like you would a tablet or piece of gear. The only way to charge the power of Leonidas's spear would be to collect the Artifact Fragments from each member of the Cult of Kosmos. It requirescollecting artifact fragments, which can only be earned by hunting down Cultists. Upgrading the Spear is done by collecting a certain amount of fragments for each level. That’s all there is to getting Artifact Fragments in Assassin’s Creed Odyssey.