After conducting a poll, the below is the attack design that got the most votes(73%). So this is now the official form of this attack.
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[Fire style - Hell Guard Hydra - Active(LV. 05): A supreme Fire style jutsu created from a giant Firestorm of wind and fire Rasengans created by the user. This is a powerful destruction jutsu that burns all things it touches to ash. This is a giant jutsu that takes the form of an 8 headed hydra. Each head can be individually used to attack different enemies. Speed and proficiency of the body of this jutsu increases with higher levels.]
[Note: If the player's Strength stat has not reached 500, it is recommended to keep some distance away from the jutsu or use defensive skills.]
[Rank: S.]
[Type: Ninjutsu.]
Hand Seals: Tiger – Ram.
[Effects:]
Burns the targets to ash and can destroy all physical defense skills and most chakra based defense skills.
8 Heads can be used independently to attack multiple opponents.
[CP cost: 6500 minimum]