How do Necros split pull?

[Izmael]

Your snare technique works. You can also root one mob, other mob runs to you, you FD. This insta-resets aggro on the rooted mob. Get up, engage mob who hasn't been rooted..

You can also simply use FD. Aggro a bunch of mobs, they run to you, you FD. They start walking back in but not all at the same time. Keep alternating FD / stand to achieve needed result.