I was thinking about something like "viking rage"
Archipel, 80% ocean
level emperor or higher, rest standard settings
Special rules:
Every coastal city must be captured amphibiously (if possible, this rule starts after invention if we don`t use a mod).
Every city must be destroyed. We want to burn the world, not conquer it. The only examples are cities with lighthouse or magellan.
If we would play this with the RAR biq, we could also try to ship the workers from the destroyed cities back home and go for a 25k victory with lots of sacrificing instead.