One more idea is to include something like Chaos magic in the game. This type of magic could show itself in the environment. If it is in the environment, it has random, unpredictable effects.
Some evil monsters might be able to wield it. It might be some type of magic coming from the Lord of Chaos itself. This could let the player see how expansive and pervasive the Lord of Chaos is when it comes to his power.
Perhaps the player character can also wield it with unpredictable results. If it comes in contact with the player, effects can be negative, neutral, or positive.
Maybe even come up with an antithesis to Chaos magic and something which counterbalances power sourced from the Lord of Chaos. Have chaos effects present in dungeon environments, outside environments, alternative realities, parallel dimensions, etc...
Chaos magic can serve to add more random effects/events to the game, create new challenges for powerful characters, make the game look more interesting, make the game more unpredictable, and keep the player on his/her toes.
For the person playing the game, this gameplay feature staves off boredom. Even those who replay the game over and over again will never know what to expect and they're more likely to stay engaged with what's happening.
Last edited by Rocky; 04/10/12 05:57 PM.