Chakra Rules

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Of course, you do not have infinite chakra. Your chakra varies based on your rank. The basic amount of chakra for every rank is:

Genin: 150
Chuunin: 200
Special Jounin: 250
Jounin: 300
Sannin: 350
Kage: 400

Jutsu costs chakra. The amount of chakra a jutsu costs for every rank is:

E: 5
D: 10
C: 15
B: 20
A: 25
S: 30
SS: 40+

Now just because you're a Genin and you have 150 chakra does not mean that you can use S-rank jutsu. Every rank can only use jutsu up to their own rank or one rank higher.

After using a jutsu in a post you spoiler it and put the remaining amount of Chakra left.

IE: 120/150


And as an added note: once your chakra pool has diminished to the point of 10 chakra or less; you're reached the point of exhaustion. At 10 chakra, you will be lucky to be conscious; below that you are automatically unconscious.