Conditions in macro

Hi everbody In a game on roll20, our characters have an "Atk" attribute (for example 70). I wanted to create a macro to: 1) Try to attack (1d100 < atk) 2) If it is a sucess, then throw damage dice (1d10 for example) 3) Decrease a "mana" attribute (by 2 for example) even if it is a fail Is it possible to do everything in only one macro ?  

Unfortunately, your macro attempts a couple of things macros can't do: 1. Macros do not have conditional logic. There is no "if-then" construction within a macro. 2. Macros cannot write values to anywhere but chat. They cannot change an attribute. Macros are essentially printouts to chat that can do dice rolls or give random results from tables (even this is not a true table lookup, just random, weighted returns). It is possible to do all of these things with the API and knowledge of JavaScript, but that requires a Pro subscription.

You can do some limited conditional logic using arithmetic. A sample Ability on a Character that reports a damage score on a hit an a 0 on a miss: /roll [[ 1d100<@{Atk} ]] * 1d10 If the d100 roll equals Atk or less, the number in the square brackets is 1, otherwise it's 0. Thus, the 1d10 roll is multiplied by 1 on a hit (equaling 1d10) or multiplied by 0 on a miss (equaling 0).

Good solution for the first problem, so long as the attack roll is not required to display.

Ok, Thank you for your answer