I recall in BG2 you change the difficulty along the way. So if the game got too easy you could turn up the difficulty - or vise versa. This would apply a multiplier to hp and damage if I remember correctly and give small bonus to XP - just to give an incentive to turn it up.
yeah but that doesnt change much cause the easiness is based on the infinite stunlock a player can do, and enemies stunlocked do 0 dmg anyway, and also the abuse of elementals/charme
you could give 500000 hp but if you charme it the difficulty doesnt change
