This heist has gone very wrong, very quickly, much to the embarrassment of Baldur's Gate 3 game director Sven Vincke. Two guards have remained stalwart at their posts, so the plan to create a distraction with one character and stroll through the bank's open doors with another has resolutely failed. Now, a chaotic battle is unfolding on multiple fronts. In the end, it's a combination of a poisonous cloud, a resilient panther, and a couple of sly teleportation spells that get the party into the vault.
The initial plan was genius, albeit heavily rehearsed. Splitting his Wizard from the party, Vincke multi-classed to take advantage of a Sorcerer ability; Metamagic lets you augment the range of spells, and now his Wizard can fly three times as far as he could before – far enough to reach the roof of the bank he's targeting. From there, a Scroll of Gaseous Form lets him travel through the building's pipes and into the bank's offices.
