How do i make success rolls get penalty from rolling 1's

I am trying to put a button on each d12 roll (custom system btw) that explodes when rolling twelves and subtracts successes when rolling 1's. i am also having trouble with the repeatable skills feature as i can't make a button that automatically references the skill that it is attached to. any help would be appreciated. current roll html: result=[[{@{strength}d12!}>?{Target Number}]] current button html: <button type='roll' name='roll_testattack' value='&{template:default} {{name=@{character_name}}} {{result=[[{@{whateverskillsyadayada}d12!}>?{Target Number}]]}}'></button>

Pretty sure that would have to be a custom API script.

Regarding the roll problem, Rabulias is correct, you cant do that without an API script. Your button macro code looks wrong. Try this: [[ [[@{whateverskillsyadayada}]]d12!>?{Target Number}]]