Title explains it. I'm attempting to create an attribute where (@{Endurance} + @{Fitness}) * 2 = @{Hitpoints} Max But have no idea how I could do it. The plan would be that for example, a character with 7 Endurance and 5 Fitness would have a max of 24 Hitpoints, and each new point to either one of the attributes would increase the max by 2. Is it possible that there is an answer for my problem somewhere but I have missed it?