Sobre el sistema de nivelado del juego (sacado de http://www.uesp.net/wiki/Skyrim:Leveling#Effects_of_Leveling)
Various aspects of the game are leveled. This means that as your character increases in level, some enemies become more challenging but also the quality of the items you find becomes better. However, the leveling system in Skyrim has been altered from that used in
Oblivion, in response to criticisms of Oblivion's leveling system.
Different locations in Skyrim have different inherent difficulties. In other words, some dungeons are designed to be too difficult for low-level characters to enter. More challenging dungeons are generally located at higher elevations, meaning that early in the game players may want to avoid mountainous regions. However, more difficult dungeons contain better rewards. In addition, some high-quality items can be randomly found even early in the game.
The level of a given dungeon is fixed the first time you enter it. Therefore, places that you enter early in the game will always contain relatively weak enemies, even if you return to the same dungeon at the end of the game.
In addition, all levelled enemies are generated more like levelled creatures in Oblivion. For example, Bandit NPCs are always a fixed level for their name (Bandits are level 1, Bandit Thugs are level 9, Bandit Highywaymen are level 14, etc). The player's level affects the range of possible bandit types generated within a bandit dungeon, and probably the frequency, but does not seem to affect the resulting stats except in a few rare cases. Lower variant bandits remain reasonably common even when more dangerous bandits are available.
Enemy types also seem to reach a plateau where they stop getting stronger. The strongest bandits (non-boss) are mid-20s. The strongest generic vampire is 54, and guards seem to stop scaling at 50. This implies that the difficulty of many areas will not increase beyond certain levels, except perhaps in frequency of difficult encounters.