In the following chapter of our Assassin's Creed Odyssey guide, you will find a description of the fight against the Kalydonian Boar in the Phokis location.
Location: Sacred Lands of Apollo, Phokis.
Suggested level of your character: 13
Description: The Kalydonian Boar is the first of the legendary beasts you have to hunt for. In attacks, it is similar to the ordinary wild boar, with the difference that it is much bigger and stronger. It is also very lively, so be prepared for a long fight. The beast is quite slow and it is best to attack it from the side, taking care of occasional bursts and charges.
From time to time, the enemy will summon a horde of minor wild boars to help him in the battle. First of all, you must eliminate them so that they don't interfere with your duel. When you clear the arena of uninvited guests, continue the fight against the boss. You will have to repeat the scheme several times and the enemy will eventually die.
You will get +3700 XP for completing the quest. Return with boar's carcass to Daphnae and you will get the legendary Artemis's Bow.