On Kingmaker was worst because hellfire ray for eg, 3 rays, half fire half unholy means that the sneak attack is applied 6 times. If you have 6d6 sneak, you can deal 24d6 + the spell damage... This not mentioning a goblin companion that can attack like 8 times per round with dual wielding weapons and a decent BAB.

Anyone knows how sneak works on 5e?