-Slower skill increase. Leveling up the character is where the fun is. Once a skill hits 100.. what's the point in using it? Slow it down so that in the new system, when I'd normally would have hit 100, I now hit 65.
-Smithing/Enchanting XP gained depends on the item you create. Making an iron dagger gives less XP than making a daedric dagger. Upgrading an ebony cuirass gives more XP than upgrading a dwarven cuirass, etc)

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I forgot about Open Locks... I'll get that one in, too.