Example is the Toll Booth Guards, which are best available to begin at level 34. Taken from
Sesserdrix's All in One Necromancer Strategy Guide
This is done in West Commonlands. Basically, you have two guards side by side. Now begins more advanced necro pulling tactics. Not that much harder, but more advanced than just casting Darkness.
On one of the guards, you're going to cast "Screaming Terror". This spell stuns and mezes a target for 3 ticks. Casting Screaming Terror will pull the other guard to you. You will want to wait until the guard that is charging you is out of range of the other guard, and then engage him with your pet. Once your pet has engaged, you need to Feign Death before the Screaming Terror ends. The mob, still being on his spawn point, will reset his hate list so you are not on it when you Feign Death. Then, you can stand up, and then save your pet from getting destroyed.
Then, just Fear Kite the one guard. Once the first guard is dead, wait about 2 minutes. Doing this spreads out their respawn timers. From this point on, whenever one pops, kill it immediately and you wont need to fear for getting adds.