Fenrilh said: Brian said: Mark G. said: KH comparisons need to include some kind of roll No they don't. They simply can't mix math and rolls (you must have only math values or only rolls). This works perfectly fine, I just tested it: {0,?{Initiative @{target|character_name}|0} - ?{Initiative @{selected|character_name}|0}}kh1 It can be used in either an inline roll or a regular /roll command. what is the " 0, " used for ? {a,b,c,d,etc...}khN will keep the highest N values from among the group {a,b,c,d}. If your group is {0, targetInitiative - selectedInitiative} and you're keeping the highest 1 value, you will get 0 if the initiative difference is negative (because 0 is higher than all negative numbers) or the initiative difference if it's positive (because all positive numbers are higher than 0).