Also, ready actions add another layer of tactical consideration, but not really as much as reactions. Still important if you don't have any other viable options, or are hoping to successfully predict an enemy to come close to another party member during their turn so that you can immediately punish them with a sneak attack, as I demonstrate in the video below.
This was a really fun fight that I went into blind, and while it may look easy, that's because I built my party to be very defensive (as in, 3 of the 4 party members have access to the Shield spell, for one). I quickly figured out that the Spirit Guardians spell (a Cleric spell that summons an aura that inflicts radiant damage if an enemy enters its area of effect or begins their turn within it) was my best defense against those enemies, because fire elementals realistically aren't smart enough to realize what it does.
(And for those of us not too familiar with DnD beyond BG3 - treat this as a preview of how crazy Paladin can be at tanking and smiting with huge amounts of burst damage, especially from level 5 onwards.)