It's similar to fighting a troll. Except that it's highly resistant to piercing damage so arrows are a no-go for the most part. Gotto get up on it with a shield and axe/sword and try-hard it. You can parry it with a lvl 3 bronze buckler. It's tells for both of it's main attacks are pretty easy to read, but with only bronze weapons you'll be in for a fight. Remember to use healing mead and stamina potions if you need to.