Well, I'll give you the basis for an event ABS, but I still suggest a script. Anyway, you need a common event set to paralell process, called by a switch which you activate at the beginning of the game and never turn off. You will need to do a few things. First, you will need enemy HP stored as a variable. You also need to know how to use conditional branches, as attack will require three conditions: first that the player is pressing the respective button. (You can check button controls by pressing F1 in play test). Next you will need to check proximity, and third you will need to check that you are facing the right direction. The first one is just to know when to show animation, and the others are to do damage. That is the basic skeleton of your event, but if you don't know eventing, then it won't be enough. I still suggest you get a script.