I hope this trend of lowering AC and increasing HP doesn't carry over to higher levels. I hardly even use spells that target Saves anymore. Mages, like everyone else, are better off standing on High Ground and spamming away with attack roll spells (or Magic Missiles with the OP amulet they provided).
By increasing Goblin HP, letting enemies wake each other up with a BA Shove, and reducing the duration, they completely neutered the Sleep spell as well.
I don't like to use Concentration spells either. You're lucky to maintain a concentration spell for two turns with Larian's obsession with surfaces and explosions in this game. Enemies also jump directly to your mages or they've been given powerful ranged attacks, bombs or aoe arrows. Protecting your mages is impossible and you're just constantly rolling for concentration and it will quickly fail.
I think spell DC's should get a flat +1DC to compensate for high ground and the increased concentration checks, and the amount of surfaces and explosions should be greatly reduced. And they should stick to MM with enemy stats instead of giving all goblins double HP, and let Sleep be great at low levels.
