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.
The Creation Engine is the successor to the Gamebryo game engine, and was launched to support The Elder Scrolls V: Skyrim.