Perks can range from simple +damage per rank to allowing special attacks with certain weapons to allowing stolen items to be sold to any merchant.

A new perk system was added, giving each skill a tree of perks to further diversify character builds.

The combat system was significantly updated, with each hand free to use any type of shield, weapon or spell independently of the other hand, allowing a much more diverse range of character builds and more complex combat tactics.This allowed better tracking of minor side quests without cluttering the journal needlessly. The quest journal was extended to allow tracking multiple quests at once, or no quests at all, and included a 'Miscellaneous' section for simple quests that would have been untracked in previous games.

The user interface transitioned from the old XML frontends and hard-coded backends to a Shockwave Flash system that, while more complex to edit, allowed much greater flexibility for modders and numerous graphical effects previously unavailable gave the interface a much more polished look and feel.The Radiant Story system was introduced with Skyrim to allow a more diverse array of dynamic quest elements and creation of on-the-fly quests, such as an innkeeper who might tell the player there's a local ogre who needs to be hunted, at which point the ogre is created by the engine rather than being created in advance by the quest team.The Radiant AI system, introduced in Oblivion, is expanded to allow non-player actors to have more diverse and believable day-to-day activities, while still being able to take part in quests and large-scale events.Animations used better blending to allow more complex actions to translate into the model, such as drawing a bow while strafing sideways and showing both actions simultaneously rather than one animation overriding the other.Shadows were greatly improved, allowing almost any object to cast a shadow in real-time and better lighting systems make the world seem more alive.Multiple levels of detail on 'distant' objects, such as cities on the horizon, allow a more immersive world space without sacrificing too much performance.Draw distance is greater to give a more epic, open-world feel.It retains much of the basic framework and has the same general feel, but adds numerous improvements over the older engine. The Creation Engine is the successor to the Gamebryo game engine, and was launched to support The Elder Scrolls V: Skyrim.

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