[RM2K3] Can someone help me out

basically like when certain conditions are met your character will be anabled to do his/her special/signature move [EX.In final fantasy 8 your health has to be like 5, 10,15,or 25% health and the characters health will turn yellow enabling him/her to unleash their special move.]do you get it now?do i need to explain more?it's basically a very pwerful move that you can only do if your bar is filled or your health is decreased to a certain point.and i would like to try to have the health decreaser limit break

First off, Whats a limit break system. I could help you but i need to know what that is first. Explain (sorry never played the FF series Shh, i know ).