Let me start out by saying that circle of death has become an awesome spell. With the hit die limit removed it has become a great alternative to wail for killing multiple targets, such as in P1 of Shroud.

Here’s the issue, I’ve noticed that it does not behave like a sustained spell, despite the description listing that it has a duration of 8 seconds. I’ll cast it at an area and two seconds later an enemy will pass through, but nothing happens, no save, no resisted, no drain, nothing. Is the description wrong? Is the spell functioning wrong? Or Am I misunderstanding something?