Yes, you gotta edit it in game.cpp (src folder)
Use search function and write "race", you will find something like that :
Code:
case RACE_VENOM:
color = TEXTCOLOR_LIGHTGREEN;
effect = CONST_ME_HITBYPOISON;
splash = Item::CreateItem(ITEM_SMALLSPLASH, FLUID_GREEN);
break;
Now you gotta customize it with your custom element :
Code:
case RACE_RACENAME:
color = TEXTCOLOR_COLOR OF MESSAGE;
effect = CONST_ME_HIT EFFECT;
splash = Item::CreateItem(ITEM_SPLASH TYPE, FLUID_FLUID COLOR);
break;
I hope it helped you a bit
~ Deepling