OK, not that hard, but if you aren't familiar with the API yet it might seem hard. Go to the main roll20 page of your game On the lefthand side click on API scripts Then you copy and paste the complete script (all of the text) into the black box Near the bottom you press save script. You are done. Then you open up your game and in the chat window type !hq h2 m3 and that will roll 2 dice for the attacking hero and 3 dice for the defending monster. If themonster is attacking just reverse them like !hq m4 h3 Thats it.