Team checks (5e Variant Rule)
From D&D Wiki
A team check is,in essence,challenge that requires 2 or more party members to roll for an ability check Their rolls are added up and matched against the Difficulty Class of the check.
If one of the participants of a team check rolls a 20,before modifiers, the other participants roll with advantage.
If one of the participants rolls a 1,before modifiers,the other participants roll with disadvantage.
If one participant of a team roll gains advantage or disadvantage after they've rolled,they must roll again and pick the roll with the lower/higher result.
A giant Boulder blocks the entrance to the dungeon The two players say they want to push it out of the way together The DM asks them to make a Team Strength check,setting the DC of the check at 30.
Player 1 rolls an 8 Player 2 rolls a 21,having gotten a natural 20,Player 1 may roll again. Player 1 rolls again,and gets a 10. The players barely passed the DC of the challenge,and their characters manage to push the boulder.
Three players decide to attempt to scare the bandit gang into running away The DM asks them to make a Team Charisma(Intimidation) roll,putting the DC at 35
Player 1 rolls a 13 Player 2 rolls a 21 Player 3 rolls a 3,rolling a natural 1. Because player 3 rolled a natural 1,the other two must roll again, and pick the lower value of their 2 rolls. Player 1 rolls again and gets a 10 Player 2 rolls again and gets a 7 The players failed to meet the DC of this check,the bandits are shaken,but not impressed...They pull out their weapons,preparing to fight the players.