Start with grave, Bones, 2xSpam, Bones, Siphon.
Keep the Grave and the Siphon always active. Between Just Bones and 2xSpam.
Skill from the NB ist just passiv. The Ultimate is the “Oh Shit” Button.
When you dont need this, take the Ult from the Warrior Guild for some more Damage and regeneration.
Dont forget the Light Attacks and use the Potion ;)