Multiclassing is incredibly accessible in Baldur's Gate 3. It's not only open to every party member at any time, but it has a low bar of entry, and any combination of classes is allowed at any time. There is even an achievement, Jack-of-All-Trades, for multiclassing a character into every class. However, with twelve classes and multiple subclasses in Baldur's Gate 3, multiclassing can become overwhelming, especially when factoring in mechanics such as spell slots, spellcasting or attack modifiers, and proficiencies.