Like many other games in its class, Fate has an active modding community. It is a mystery what happened to the evil old man from the introduction, but it is possible that Kaos and the old man are the same being. Once the first two realms have been completed, the player must return to the quest-givers in the Temple of Fate, whereupon a new dungeon is unlocked and the player tasked with defeating the lord of the dungeon and final boss in the game, Kaos. The statue will release the potion as many times as the player wants, but the prize is only released once. When all the missing clothing has been put back on, the statue will release a prize, and a potion which will turn the player's pet into the hero that the statue depicts. There are also two statues in the Temple: in specific levels the player will find missing equipment which they must then put on the corresponding statues. Players start in the Temple of Fate where they are given quests to enter and complete the dungeons of Typhon and Druantia. Each dungeon is only about half the size of the original dungeon in Fate. Each realm features new randomized dungeons, shopkeepers and non-player characters (NPCs). In this game, the town of Grove has been replaced with three new realms: the Outpost of Druantia, the Outpost of Typhon and the Temple of Fate.

The hero must now stop this new foe by exploring the dungeons of Druantia, a realm of mossy forest and dry tunnels, and Typhon, a frozen tundra and arctic wasteland.

The old man has tricked the hero, and opened the Book of Fate, gaining its powers. But during the festivities an unusual old man appears and convinces the hero to come with him, telling him that another great evil has arisen. The hero of the town of Grove has completed his quest and celebrates his victory. The game is advertised as having infinite dungeon levels, although this is not technically true: according to the publisher's website forum, at level 2,147,483,647 (2^31-1) the game runs into computing problems and the character can go no further. Users are given the option to import their character from Fate if they own the first game. The dungeons in FUR are fully randomized for each level the layout, treasures and monsters are all different each time you visit one.

This type of game is also known as a dungeon crawler, where the player takes their character through progressively more difficult levels of a dungeon, fighting monsters, completing quests, collecting valuable items and gold, and improving the character's attributes and skills along the way. Like Fate, FUR is a fantasy action role-playing game similar to Diablo and Diablo II.

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