I'm not sure what you mean by null/enhance. You mean how certain things take more/less damage from certain elements? That's totally in the game. Each enemy has an element, and it will be resistant to two elements (It's own and the one it is strong to) and vulnerable to another. In addition, some enemies take it one step further. Flans will absorb whatever element they currently are (Depends on their color, and they change element every so often), and I believe elementals and primals are immune to their element.