I had so much fun! Here's my solo map (done with inkarnate):
Shimmering Guards: Lizardfolk with shiny, yellow skin due to abundant Golden Fish consumption. When their fort was destroyed, the general public accused Jark (pictured on the left, going back home after a hearty meal); however, a thorough investigation led by the government officials found the halflings guilty. They subsequently waged war for Sanditon, a small settlement of the Halfling Confederacy as a "proportionate response". This was a smashing success for the lizardfolk, who prospered with their newly-found Scorching Sand.
Lebensfel: Giants who rely on and venerate extremely sturdy Dark Birch to construct their cities. They would immediately replant any tree they had to cut down. When the Shimmering Guards straight up massacred the Birch to connect cities (with a handy market in the middle), many Lebensfel giants demanded vengeance. Instead, the royal family erected a beautiful mausoleum for the fallen (trees). This somehow led to a rebellion.
The Unyielding League: Giants who left Lebensfel to found their own faction and take revenge on the Shimmering Guards. They couldn't do much for a while; but in the end, a mysterious allience with an undisclosed society helped them get rid of the lizardfolk in the continent. There are reports that they are now building ships...