Hexen is the sequel to Heretic . While the Heretic was destroying D'Sparil, the other two Serpent Riders have come to your dimension and slaughtered everyone. Or so they thought. Three humans have managed to escape with their lives and now seek vengeance against the Serpent Rider Korax who remains in their world.
Other innovations in Hexen include weather effects, jumping, earth-quakes, and destructible objects such as trees and vases. The game also includes scripted sequences created with a language called ACS, allowing for much more complex puzzles and dramatic scenes.