[RMVX] INCREASE ENEMY SPECIFIC WEAKNESS TO ELEMENTS?

As the title says, is there a script to increase a certain enemies specific weakness, outside of the default options in RMVX? I've looked in YEM battle engine melody and didn't catch anything that seemed to perform that function.

For example, think pokemon. I fight an enemy boss made of water. I want my standard lightning spell to do 500 damage to him, whereas at that current level it would only do say 75 damage to all other enemies.