Spells have generally always been adjusted downward as editions progress.
Oe 1st level charm person generally makes the person your permanent slave if they miss their save. The duration and effects have gone down and changed each edition.
Charm Person: This spell applies to all two-legged, generally mammalian figures near to or less than man-size, excluding all monsters in the “Undead” class but including Sprites, Pixies, Nixies, Kobolds, Goblins, Orcs, Hobgoblins and Gnolls. If the spell is successful it will cause the charmed entity to come completely under the influence of the Magic-User until such time as the “charm” is dispelled (Dispel Magic). Range: 12”.
1e magic missile does 1 missile +1 per 2 levels and fireball and lightning bolt do 1d6 per level. 2e MM is capped at five missiles at 9th level and FB and LB are capped at 10d6 at 10th level. 3e keeps them at that 2e level while monsters go up in hp from con bonuses.
