I agree with Frammelpie, Katta is an excellent zone for a necro. Hunt the guards in the main courtyard. Start with the 2 in front of the tavern, then take the 2 at the foot of the stairs, then take the two in front of the bank. If you pull with splurt, you can get a single guard. By using splurt, your pet should be able to get agro before they even get near you. Pull em, send in your pet, darkness, fear, and dot. Repeat until courtyard is clean. Med up and wait for repop. I went from 55 to 60 there in about 2 weeks. If you 2 or 3 box, let the other toons loot and sit for exp, they can also use the bank, sell the armor drops to vendors in the tavern, and buy food and water.
BW is a good place also. There are alot of undead camping spots. Pull, send in pet, darkness, fear, slow, and dot. They go down pretty quick. The exp is NOT as good as Katta though.
Lastly, the Hole. I love that zone. Plus this dungeon gives a %25 exp bonus. Go invis until you run into the constructs. (Constructs see thru invis) If you do them slowly, you should be able to get the constructs one at a time. You only need to do 3 of them before you get to the city gates. Make sure you LOOK UP. There are gargoyles stationed around the city on top of buildings, but if you look for them, they can easily be avoided. The gargoyles at the gate usually don't attack. Kill the 2 wandering contructs and work your way to the harbor area. The city itself is full of undead. Go slow. Once to the harbor area, in the far corner across from the pier, you can set up your camp and pull. The wandering constructs do not wander to your camping spot so you should be safe. Make sure you darkness any undead since they will run at 20% and the last thing you want are adds. Just start pulling. EXP and loot are terrific. You will probably need to gate out, unless you want to fight your way back out. I usually made 1000p an hour there, with drops, plat, and items.
Descarte Meditations Lvl 65 Arch Lich - Povar