That Sucks!

[Empirate]

Well, there's Repulsion, which can easily be flavored that way, and the similar Repel Wood and Repel Metal, and Antilife Shell. All of those work by pushing people or things out - however, you could call it sucking instead of pushing (there's actually no mechanical difference) and leave it at that.

 

[Samloyal23]

Is there an anti-air spell anywhere? Have you seen anything like this in other games, like a superhero or sci-fi game?

 

[Manbearcat]

What you're talking about here is not really vacuum-relevant as the poor saps nearby are not exposed to lack of proper decompression from immediate, massive, pressure gradients (if they were then you would be talking about "bends" type issues - lung, inner ear/Eustachian tubes damage). However, the massive pressure differentials in such a small space should, theoretically, have enormous impact on the immediate environment. You're talking about enormous wind-speed moving particulates and anything not tied down (probably even the user) from the normal/high pressure of the prime world toward that pinhole apparatus that opens to that extreme low pressure. It would basically be physical trauma damage from shrapnel/flying objects (like in a tornado). Escaping it would be an exceedingly high Str check.

 

[Manbearcat]

Beyond that, if somehow they do get sucked into the vacuum, you're basically talking about passing out and death from total depletion of oxygen in the blood (assuming you don't try to hold your breath). That would take place anywhere between 15 seconds to a minute - lets call it 3 - 5 rounds typically. The inside of your body is still pressurized, therefore, were you try to hold your breath (rather than letting it out) you would likely suffer death by embolism and rupture of the circulatory system (but you wouldn't explode) rather than anoxia (total oxygen depletion). Regardless, it doesn't really matter. You're dead.

 

[Manbearcat]

I would treat the effect mechanically like Black Tentacles