This axe is cursed, and becoming attuned to it extends the curse to you.
As long as you remain cursed, you are unwilling to part with the axe, keeping it within reach at all times. You also have disadvantage on attack rolls with weapons other than this one, unless no foe is within 60 feet of you that you can see or hear.
Whenever a hostile creature damages you while the axe is in your possession, you must succeed on a DC 15 Willpower Contesting Roll or go berserk.
While berserk, you must use your attempt to attack the creature nearest to you with the axe.
You are berserk until you start your turn with no creatures within 60 feet of you that you can see or hear.