Interesting boss mechanics stolen from videogames

Ideas for Combat Encounters
[Let's Build] d100 developments/events during a 24-hour siege of a...
Clown/mind fuck combat scenarios/mechanics?
D100 Interesting boss mechanics
d100: City Quests
Some *weird* things an Eldritch Horror would do in combat?
Suspense Die - d4 in the open before calamity
Random Encounter- A Giant Dinner
Table of creature non magical abilities the require saving throws.
100 (Random) Composed Encounters: On the Road
Fetch quest to defeat a God?
More combats that aren't just run in and kill everything.
Lowering AC During Combat
50 different enemy encounter goals, from 'humiliate' to 'split the party', from 'snatch' an item to 'assassinate'
Mixing Up Different Types of Enemies in One Combat
List of Conflicts (for race, class, skills, etc.)