Consider, Hintermist:
It's doing damage at the wrong time, and only sometimes doing damage at the correct time. This means that if you use the spell in what should be a tactically sound way, you may, in fact, receive no damage whatsoever from it. Suppose you place your moonbeam in a choke point that the majority of nearby enemies (let's say 4 of them) will need to move through to reach you - if the spell was working properly, each creature that entered the moonbeam or started its turn there would make a save and take damage as they ran through to reach you. As it works in bg3 right now, the spell attempts to do damage when cast (but no-one was in the choke point so nothing happened), and then seems to be often failing to process targets entering or starting in it at all, so only some, or possibly none, of those four targets will take the hit as they run through to your party.
Don't defend this.
