How do you create a suffocation effect? Suppose the effect is entombing the target in ice or stone with no air supply. The entombing part is easy. It's just an Affliction with Immobile, no third effect.
But how do you impose the "you have no air" effect on the target? Obviously immunity "suffocation" makes the target unharmed by the lack of air.
At first I thought Environment. But more Environment effect are much weaker than removing all the air in a space. In fact, oddly, Environment effects have only two levels. But in the Environmental Hazards: Heat and Cold section, three levels of extreme heat and cold are listed. So why can't power create all three levels?