Mythology

Their are nine giant known tailed beasts (Biju) in this game. They are differentiated by the number of tails they have, ranging from one to nine. The Tailed Beasts are large, living forms of chakra, sometimes referred to as "Chakra Monsters" giving them power that far outmatches most shinobi. However, this immense strength is tempered due to their bestial nature, which restricts them from being intelligent enough to use it effectively. When the Tailed Beasts are sealed within humans, they are able to benefit from the knowledge of their hosts, giving them the ability to better utilize their powers.

One-Tailed Shukaku.
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The Two-Tails Nibi.
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The Three-Tails Sanbi
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Four-Tails Yonbi
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The Five-Tails Gobi
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The Six-Tails Rokubi
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Seven-Tails Nanabi
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The Eight-Tails Hachibi
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The Nine-Tailed Kyubi
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Over the centuries, the Nine-Tails had gained a reputation as an age-old natural disaster, appearing suddenly out of nowhere to attack areas wherever human malice had collected and festered.

Ten-Tails
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The Ten-Tails Jubi; is the original, primordial demon of the Naruto universe. All nine of the tailed beasts are but portions of chakra divided from the Ten-Tails. Madara Uchiha's ultimate goal, the Eye of the Moon Plan, is to capture and merge all nine of the tailed beasts back into the Ten-Tails, and become its jinchūriki to cast the reflection of his Sharingan on the moon, casting a genjutsu known as the Infinite Tsukuyomi which will put the entire world under his control.