[Suicide Junkie]

To make the Null-Space damage more "realistic", it would take a percentage damage off everything.

If your null-space "projectile" has a very small radius in normal space, it could poke a very small hole in your shield/armor, and then destroy a small number of internal components completely.

The outer hull should be able to take quite a few holes before you get a serious unpatchable atmosphere leak, but people, electronics and precision machinery all have very low tolerances for having holes punched through them