This 6p scenario is inspired by the Hunger Games, and it's trying to bring the experience to wesnoth.
To simulate it,
-income and gold is always low (so your leader plays a bigger role)
-villages are few and far apart (to simulate bonus items)
-keeps are one unit only and in strategic locations (again, so leaders actually play a role)
-the players all start in a central hub
-around turn 60, spiders are released to flush the remaining players together.
AI offers only a token challenge, use friends for best experience