Necromancer needs some really extensive work. Right now powerwise it’s in a decent spot, but it has several problems.
1: Too many 1 point wonders (especially in curses).
2: Synergies need to be distributed better - for example, Poison Dagger should synergize with Dim Vision, not the other Poison skills. Golems should not be synergized with each other, but with themed support skills.
3: Corpse Explosion probably needs to be rebalance around putting a full 20 points into it, but then that means all the other skills and synergies need to be rebalanced around needing 20 points in Corpse Explosion.
In other words, a lot of this has to be done at the same time to keep the balance right.
One of the few things they could do as a stand alone thing is to rebalance the Golem synergies so that Blood Golem and Fire Golem are decent without putting points into other Golems and can be run with just that Golem and Golem Mastery.