UNDECEMBER is a free-to-play action role-playing slasher game with an isometric camera view in a fantasy setting. The game will tell about a dark fantasy world where the evil deity Serpens appeared. You have to go through several story acts, leveling up your character in endless battles. One of the main features of the project is a flexible development system without class restrictions. For example, you can create a conditional barbarian, but use spells in conjunction with ranged combat. After completing the story campaign in Undecember, end-game content opens: the Dungeon of Chaos and a boss raid.