Games such as Baldur's Gate 3, and by extension Dungeons & Dragons 5e, pay huge attention to party composition due to their nature as RPGs. In turn, the wrong party lineup can easily ruin a player's day if they mess with the wrong enemy. Thankfully, class roles circumvent this caveat by assigning certain responsibilities to certain characters. However, it's the Tank that has the biggest responsibility of all: prevent everyone from dying.