Board Thread:R2D - Suggestions/@comment-26313868-20150529022332

Basically, if no survivors were killed in 120 seconds, they zombies will gain +10 health max health upon respawn every 15 seconds until a survivor dies. When the person dies, the sudden death damage increase resets to none and it all goes over again.

It'd help spice up games without too much of a difference except that zombies will be stronger if nobody dies 