Islebound: Deep Fog (2016)

A mysterious creature has risen from the deep, shrouding the archipelago in a thick, mysterious fog. Navigate your way through the treacherous mists, building your strength and increasing your influence, until you can finally defeat the monster. Or perhaps politely ask it to go away?

Deep Fog is a bonus scenario for Islebound, which includes one 2-sided card and an instruction sheet. As the rules explain succinctly, "With Deep Fog, players navigate through a rotating stack of sea boards instead of laying them out in a fixed map. The game ends when a player is able to defeat the fog monster, either through military prowess or diplomacy."