[1] Wargroove is a Nintendo Wars-style turn-based tactics video game in which players explore maps and battle foes.

Felheim is usually an anarchy, but every few decades a new warlord masters the necromantic Fell Gauntlet and uses it to muster an undead army to invade more hospitable areas of Aurania.

Aurania's east is the seat of the Heavensong Empire, a more technologically advanced nation of inventors and artisans.

Mercia's mentor, the royal mage Emeric, advises her to seek aid from Empress Tenri of the Heavensong Empire.

Along the way, a series of misunderstandings lead to clashes with both the Floran Tribes and Heavensong, but eventually Mercia meets Tenri and is granted ships and supplies, allowing her to launch a seaborne counter-invasion of Felheim.

The vampire lets slip that she orchestrated the war by tricking Cherrystone and Felheim into thinking that each was attacking the other, and then absconds with Mercia's family sword, the Cherryblade; Sigrid's goal from the outset had been to find the key to unsealing the ancient weapon Requiem so that she could conquer the world, and the Cherryblade had been that key all along.

With Valder now on Mercia's side, she chases Sigrid to the Dragon's Cradle volcano and defeats her, but is too late to prevent the unsealing.