Larian Studios Forums Baldur's Gate III Baldur's Gate III - Mega-threads and Guides Differences and Similarities between BG3 and D&D5e core ruleset.

5e rules don't actually have flanking at all, but some form of house rules for flanking is pretty common. The most common I've seen is that flanking attackers get advantage, which sometimes feels a little too strong. I play in some games where flanking attackers get +1 or +2 on their attack rolls, which feels a lot more reasonable. Advantage is a pretty big deal to give away that easily (not that it's always easy).