Concept 1 (derived from above):
- The protagnoist has a number of strengths which they build up during the game.
- The strengths derive from changes in the game environment, cities converted, artifacts held, skills learned
- The antagonist will register growth in each of these, and will attempt to remove or counteract the protagonist's strength in each area by various means
- Not sure how the antagnoist woudl compose sufficiently clever means