My latest version of Astarion was a Thief/Sword Bard with the Band of the Mystic Scoundrel, which allows you to cast Enchantment and Illusion spells as a bonus Action after a weapon attack. His Spell DC was high enough to reliably hit enemies and because he himself rarely got hit by anything, he didn't come to too much harm and his concentration held well enough. Though I have to admit that Dissonant Whispers still was my favourite thing to cast because it combines fear and damage without the need to concentrate.
My biggest regret about Act 3 gameplay is, that there aren't that many fights in which you can really flex all those nice spells you have gathered over the course of the game. So, many spells simply go unused because Act 2 has a rather niche menagerie of opponents.
Last edited by Anska; 15/01/24 06:02 PM.