I have the sinking feeling that I'm doing something wrong on my necro

[RevengeofGio]

Okay so I'm sitting grinding solo fairly safely and its taking me an upwards of 6-7 hours of killing dark blues and an occasional yellow if I get lucky at orc highway in Oasis to go from lvl 19-20. Part of me is thinking well its because I didn't get my new health -> mana spell till 20, but part part of me is thinking I'm doing something wrong.


Basically I pull with darkness, then fear, sick pet heart flutter and heat blood. Sometimes that's about all thats needed sometimes an extra heat blood or auto attacks. I can maybe do 3-4 pulls before I'm sitting for a bit. Am I supposed to be using less dots? Is this just how it goes for a bit? I didn't die at all from 19-20 and it still felt like forever.