Baldurs Gate 3: Raphael 1 shot kill (SPOILERS)

Using the Twist of Fortune (Obtained from the toll collector in act II) And about 47k gold to one hit K/O. There seems to be an interaction between this and the ilithid power Cull the Weak, amounting in much higher damage than it should. It is most likely a bug. You could legitimately kill him without this interaction if you have enough gold, and use the Amulet of Branding (for piercing damage amplification).