Put sockets in the fist of your mesh and add a collision sphear in script turn them on and off as you punch, then add an overlap event with an on hit node, progress the node to do the DMG you want to do, its rudimentary but should get you started, there are a few different ways but this is the easier of them. You could also use a line trace instead of the sockets and just spawn a collision hull at the end, you could also add the collision hull with out any of that and make it a child of your main mesh and just set it to collide with what’s in it when you tap the button, hope this helps.