WorldCrasher is a utility mod that adds one keybind (by default 'U') that, if in a world, will crash it. All of my experiences in testing the mod have proven that you can play on your world after you've crashed it - no noticeable damage has been done, aside from maybe a half minute rollback (as per not saving the game).
Now, you might be thinking - why would someone want to crash their world? That's an amazing question.
Don't worry about the mod icon, by the way - it definitely has nothing to do with the mod whatsoever.