how do I die less from voids?

[dex]

This is annoying:

A Grimswarm orc warlock throws his head back and roars, shaking off the stun!
A Grimswarm orc warlock gestures at you!
A void rips open in the area, directly above you!
You are sucked into the void!
Rather abrupt decompression causes you to explode!
Billions and billions of tiny bits of flesh shower everything.
Quite severely dead.
* Kupaka has been vaporized!

A Grimswarm giant dissembler throws her head back and roars, shaking off the stun!
A Grimswarm giant dissembler gestures at you!
A void rips open in the area, directly above you!
You are sucked into the void!
Rather abrupt decompression causes you to explode!
Billions and billions of tiny bits of flesh shower everything.
Quite severely dead.
* Kupaka has been vaporized!

Why isn't there a formula being shown? Is there no TD defense for this? I don't see anything on Wiki for this.