Six-Tails Chakra Mode

Six-Tails Chakra Mode, like other transformations like it, is a heightened transformation unique to those who have the Six-Tails' chakra sealed inside of them, along with acquiring perfect control over it.

Utakata
When used by Utakata, the chakra is molded into likeness of Saiken, complete with six chakra tails. In this form, however, Utakata is still not completely in control of his actions, though his power, speed, and strength are all drastically increased beyond their normal levels.

He can also generate at least one of Saiken's actual tails, which he can use for a variety of actions.

Tailed Beast Mode
The user of this transformation can completely transform into Saiken with enough control over the beast's chakra. In addition to the massive increase in chakra, stamina, and strength, the user also gains direct access to the Tailed Beast Ball technique and all of Saiken's unique abilities as a tailed beast. The transformation also seems to cause a great deal of stress on both the user and Saiken, as, without prolonged training, remaining transformed for extensive periods of time is completely impossible and, in some cases, even dangerous.