Stuff like "Actor 1 used Ice Volley!" or "Actor 3 is suffering from poison." I think you can change it in the engine's code, but I'm not 100% sure. So if you don't mind using plugins, Yanfly's Battle Core let's you change without doing all that digging.
That is the battle log, and you would need to do a script mod to change it.
I've moved this thread to JS/Plugin Support. Please be sure to post your threads in the correct forum next time. Thank you.
Your profile says you primarily use VX Ace, but you posted this question in the MV forum. Which one are you using? The answer will be very different. If you ARE using Ace, I'll need to move the thread again.
functionality(This is function demo not game demo)
1 The door of ABS map can open upon clearing all the monsters
2 Secret room/road arrow/lighting/whatever others can be shown upon clearing too
3 Boss HP bar and loot effect, loot jump and item name color as well as the pick-up animation effect
4 Back to town and "victory aftermath" screen for ABS maps/rooms
Playing one of the two RM2k3 games I was best known for back in the day, one I made in the Spring semester of my Freshmen year in college like 15 years ago, feeling all kinds of ways about it. I have not played this game in WELL over 10 years. I feel a million years old RN.