Advantage & Disadvantage (PSR Supplement)
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Sometimes a game effect imposes advantage or disadvantage on a specific d20 roll. When that happens, you roll a second d20 when you make the roll. Use the higher of the two rolls if you have advantage, and use the lower roll if you have disadvantage.
Example: If you have disadvantage and roll a 18 and 4, you use 4. If you had advantage, you would instead use 18.
(Dis)advantage Doesn't Stack. If multiple situations affect a roll and each one grants advantage or imposes disadvantage on it, you don’t roll more than one additional d20. If two favorable situations grant advantage, for example, you still roll only one additional d20.
They Completely Negate Each Other. If circumstances cause a roll to have both advantage and disadvantage, you are considered to have neither of them, and you roll one d20. This is true even if multiple circumstances impose disadvantage and only one grants advantage or vice versa. In such a situation, you have neither advantage or disadvantage.
