In regards to the awesome Void Dragons from Bestiary 4, how does their Suffocating Breath power work?
"Instead of dealing cold damage, a very young or older void dragon can breathe a cone-shaped suffocation effect. An air-dependent creature that fails its Fortitude save suffocates for a number of rounds equal to the dragon’s age category. The save DC is Constitution-based."
Does it immediately set them to suffocating per the environmental rules (Unconscious @0hp, -1hp and dying, dead), does it just make them hold their breath, or does it allow multiple saves a la the Suffocation spell?
It seems like the first option is a good recipe if you hate your players and want a TPK, and the second is only useful for flavor since darn near any PC can hold their breath 12 rounds, The third seems more balanced though still nasty, but also not really supported by the ability description as written.