What happens when your damage roll is negative

[Typewriter]

Sneak Attack and other bonus dice aren't multiplied on a crit, though, which could be extended to a rule that such dice are ignored entirely for purposes of criticals and added on afterwards. If you do 1d2-4 and have 2d6 SA, a crit by this interpretation wouldn't do (2d2+2d6-8), it'd do (2d2-8)+2d6. Even if your damage was 1d2-9001, you'd roll that and get minimum 1 (or 2d2-18002 on a crit), then add your 2d6 sneak attack after.

Yeah, that's why I added the SA damage after the multiplier.

Do you add SA before or after rounding up to 1? That's the important question:

Crit damage: -4

SA damage: +4

Final damage: 0(Minimum 1) or 5(Minimum 1 from damage, +4 from crit)?