The explanation for this is that Astarion is a vampire. According to the official D&D handbook, whose rules were replicated in Baldur's Gate 3, vampires receive Acid damage upon contact with running water. This is especially true for various kinds of rivers and ponds. This does not apply to...
meaningful glances, and tense non-verbal exchanges over WASPy Thanksgiving dinners of yesteryear cross her desk; it’s that realism in fiction has very largely been supplanted by fast-paced street fighting, a little light bondage, and sparkling vampires who, in defiance...
"Tell me what the point was then, Bella! What was the point of me loving you? What was the point of you loving him? When you die"—the words were a snarl—"how is that ever right again? What's the point to all the pain? Mine, yours, his! You'll kill him, too, not that ...
Vampires are notoriously threatened by a paladin with a holy sword and a gang of spell slinging sidekicks. That's kind of a great equalizer. Rogue and mage types rarely have any societal pressures, aside from the occasional man who may rightfully or no regard such a woman as a bawl-buster...