Is there any way...

[Deathell]

...to make it so the rain in your map is red? Like blood?

 

[pandamanana]

mmm I know there is a way to set a color tint to your water? would rain count as water?

 

[Deathell]

I dont think so...

 

[Dr Super Good]

Somewhere is some kind of texture or skin for rain.
You just have to recolour it to red and it will be red.
But unfortunatly I do not know of such a file and thus you are on your own to find it.