its at back wards at the spine'
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The 8 gates is a forbbidin style which forceable opens the chakra gates to increase speed, reflex, agility, and strenght to a level far beyond even a kage.
The 8 gate increase damage to the opponent but cause damage to the user here are there rules.
Gates 1-3 increase damage by 3 for each hit, user damage=3 per turn gate is active
Gates 4-6 increase damage by 6 for each hit, user damage=6 per turn gate is active
Gates 7-8 increase damage by 8 for each hit, user damage=8 per turn gate is active(8th gate kills user after the attack is done)
Important Note

Dont use the gate any longer then needed and only gate damage to user is applied to any of the jutsu that have its requirement time 2)
Attack damage
Punch:damage=2
Kick:damage=4
Body Slam:damage=6
don't ask me to teach u gate techniques i don't know them
tell me wat did u understand by dat