Advanced Macro help!

So I'm running into a few issues. First: I'm trying to find out how to reroll natural 1's for the Halfling Lucky talent. /roll 1d20r<1 doesn't quite do the trick. While it'll reroll a natural 1, it'll continue to do so, and Lucky, only allows you to reroll a natural 1 the first time, so  in the extremely unlucky event that I reroll 1 twice in a row, I want it to keep the second... I tested /roll 1d20r<1r>1  but, as I suspected, that doesn't do the trick :). Second: I'm trying to see if there's a way to add an if/then style macro for critical hits. Use something along the lines of [[1d20cs>20]] if<20 [[1d8+5]] if>20 [[2d8+5]] ... Can this be done?

Hey Elcarim, What system are you using? Pathfinder and D&D have community created sheets that have custom roll templates that will do the if/then situation that you're asking about, outside of that or the API, there isn't really if/then capability. For the single reroll, try this section of the  Wiki .

D&D 5e

[[1d20ro1]]  (re-roll once) I would recommend using the Dungeon and Dragons 5e character sheets.  They'll handle the critical roll for you by only showing the extra damage dice if it's a crit.