Yup, the first boss is the second toughest boss I've fought so far in this challange but as long as you've stocked up on potions from the first town, it's not too hard. Just don't be afraid of using all your potions. Thanks to the Monk class, stuff gets a bit easier for a while. In the begining everything is just as easy as normal. Then, after a while, the difficulty level goes up every now and then. In my current situation, most random encounters can do about 40% of my characters total HP in dammage with a normal attack. Stronger monsters, like Sand Bears, does about 50-60%.