When i set ADVSAV:poison it makes all saves have advantage

[Dracius]

Have any player with a racial trait like that, put it on their "Special Defenses" section of their character sheet.

It'll cause it to show up on the party window, which a lot of GM's and Players keep open. That way you can always see it right there as a reminder.

[Klandare]

The way that I created it was make the ADVSAV: con (or constitution written out can't remember which and can't get to open my session right now). And then just toggle that off on players if the poison is not a con save. But from what I have seen it works most of the time.

One thing though, is if you do have to make a normal CON save (no poison) then you also have to toggle it off. Clunky but seems to work for us better than having to remember to toggle the ADV on all the time.

I did the same sort of thing for Fey Ancestry for the Charm spells with wisdom.