There are 2 weaknesses. First, the Apprentice stone makes magic damage 100% more powerful; an extra 50% on fire damage for being a vampire. You use your wards to combat this, but as you will be trying your hardest to make enemies attack you, one wrong move and you're dead.
The second weakness is you need to pay attention to your followers. If they die, the amount of damage you do goes down, but at the same time, you need to drop your shield while being attacked in order to heal them, which makes you more likely to die. You just have to find the right balance.
There are 2 weaknesses. First, the Apprentice stone makes magic damage 100% more powerful; an extra 50% on fire damage for being a vampire. You use your wards to combat this, but as you will be trying your hardest to make enemies attack you, one wrong move and you're dead.
The second weakness is you need to pay attention to your followers. If they die, the amount of damage you do goes down, but at the same time, you need to drop your shield while being attacked in order to heal them, which makes you more likely to die. You just have to find the right balance.