Avalon is one of the two primary settings in Tides of Annihilation, alongside London. It is the mythical island from Arthurian legend, reimagined as the home base of the game's primary antagonist faction: Morgan le Fay's eight sisters, collectively referred to as the demi-gods of Avalon.
The eight sisters
Morgan le Fay and her sisters rule Avalon as a council of powerful sorceresses. In later Arthurian tradition, Morgan leads nine magical sisters in total. These demi-gods are responsible for the invasion that destroyed London and are the ultimate targets of Gwendolyn's quest for vengeance.
Tyronoe
The most prominently featured sister so far. Tyronoe is also called the Ferryman. She is a shape-shifting sorceress who can transform into a massive bird beast. She created the Mirror Space Folded Realm barrier and was responsible for the destruction of a region called the Whitelands. Before her betrayal, she served the White King as a court sorceress. Her boss fight was showcased in the Xbox Partner Preview trailer (November 2025) and is one of the most visually spectacular encounters shown so far.
Role in the story
The demi-gods of Avalon are behind the otherworldly invasion that fractured London. They opened a passage between realms that allowed their forces to pour into the mortal world. Gwendolyn's quest to collect Grail Shards is partly about finding a means to counter Avalon's power and confront its rulers.
Arthurian origins
In traditional myth, Avalon is an island of healing and magic, the place where King Arthur was taken after his final battle. It is associated with Morgan le Fay, enchanted apples, and the forging of Excalibur in some tellings. The game keeps Avalon's identity as a mystical otherworld but recasts its inhabitants as the primary villains rather than neutral or benevolent figures.