How do I make a damaging force-field?

[Odin]

I'd like to know how I can make a damaging forcefield, just like the one in ATCS. I also don't want the aliens to be able to wallwalk on it.

[DIGI_Byte]

trigger hurt to hurt them
set the dmg to about 10 - 15 for a weak shield
make it stick out slightly infront of the shield

and shield texture you could make your own and create a shader with it

im not sure on stopping them walking on it though...

[Moofed]

The force created by taking damage should take care of wall walking.

[vcxzet]

im not sure on stopping them walking on it though...

textures-common-slick shader does this job