At the start you dont go to gromp or krugs you go and do alone wolves or razorbeaks,but I recommend you to do wolves.Why?It is simple as that.In 6 places you have Cristal Spires which are your passive.I mean that if you stand in their range you have a lot of attack speed,movement speed and also mana regeneration.You can go easily at wolves do it alone and have full hp without using any health potions.