Tainted Grail: The Fall of Avalon belongs to the RPG genre. This is part of a small series that also includes a card roguelike. Both titles are adaptations of the popular board game. The digital continuation of the franchise is no longer a CCG, but a full-fledged role-playing game. It has an open world that needs to be explored from a first-person perspective. The indie project uses a dark fantasy setting. It is inspired by the legends of King Arthur and Celtic mythology. Here you can fight a variety of evil spirits using medieval melee and ranged weapons. Quests can be completed in different ways. Thanks to gray morality, there are no clearly good or bad options here. However, the decisions made affect the protagonist's reputation.

The Defiled Grail: Fall of Avalon project takes place on a cursed island. By the time the story begins, the famous ruler is already dead, and people are trying to find a new image that will inspire them. They are also trying to survive against many adversities. Their problems are not limited to just the invasion of monsters. A plague called the Red Death is spreading across the lands. And Wirdness is spreading across the area. This mysterious force distorts reality itself and turns it into chaos. The plot begins with the arrival of people on the mysterious Avalon. Instead of heaven, they see hell, after which they are divided into factions and want to decide what to do next.