This post will go over the eight gates restrictions and boosts.
To be able to open more than one gate you must only use Taijutsu.
For every gate that you open you will gain an additional 2000 chakra, but you will lose 4000 chakra for each gate you open once it wears off.
Example - You open 4 gates so you gain 8000 chakra, but once it wears off you lose 16000 chakra.
You can only open up to 7 gates because you will die if you use all 8.
When you first use it it will only last for 2 posts. It goes like this.
1st use 2 posts
2nd use 2 posts
3rd use 2 posts
4th use 2 posts
5th use 3 posts
6th use 3 posts
7th use 3 posts
8th use 4 posts
9th use 4 posts
10th use 4 posts
11th use 4 posts
12th use 5 posts
The max time you can have it up is for 5 posts
Hm, well that's what I can think of for the eight gates. Kaname if you want to change something please do, or if you want to add something go ahead.