Do you have necro in your build?
Templeshooter
Do you just want to ride until the end of days and be cheap?
Netherbovine (mobbing) or Necroventer (bossing)
For mobbing, it’s either templeshooter or netherbovine.
For bosses, I like using necroventer or mirtis (use necroventer as a cheaper option, you can just get him from doing lvl 80 dungeon)
I personally like using mirtis for bosses that move around so much and that summon mobs because of her 1st skill.
Nuaele is decent, but I hate her animation.
Helga got nerfed.
I personally wouldn’t spend a dime on a single demon lord. They’re not worth the price.