In Assassin's Creed: Odyssey you can unlock abilities with Ability Points that you accumulate with levels and experience in-game.
Once you have reached level 50, you can also spend your Ability Points on Mastery Levels.
To get to the Abilities screen, simply open the menu while you are playing and navigate to the tab Abilities.
The ability tree is made up of three sections: Hunter, Warrior and Assassin. Each of the sections focuses on a different aspect of the gameplay, allowing you to customise your character to match your playstyle.
Your available ability points are displayed in the top right of the Ability screen, your level above, next to your experience bar.
Most abilities can be unlocked several times - the effects will stack up for each time the ability is unlocked, making it more powerful. A small counter on each Ability symbol will show you how many points you have invested.
Some abilities require other abilities to be unlocked first before they become available. Abilities that cannot be unlocked yet are hidden behind a padlock symbol. Be aware that some Abilities require the Spear of Leonidas to be upgraded before you can unlock them.
The bottom row represents your basic skills which cannot be removed or changed. The spaces titled Ranged and Melee to on the left and the right allow you to select other abilities that you'd like to be active. Drag and drop an ability into one of the four slots in either the Ranged or Melee box to make them available. For the Ranged box you will be able to only select abilities from the Hunter tree. Similarly, the Melee box can only hold Warrior or Assassin Abilities. You can change which Abilities are assigned any time.
You can change the Abilities you unlocked by resetting them.
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