Yeah, so let's start with ISM!
( Fukanzen Hebi Sennin Modo ) - Imperfect Snake Sage Mode
Type: Supplementary
Rank: S
Range: N/a
Chakra cost: N/A ( -10 turn to sustain )
Damage Points: Active + 20 damage to all ninjutsu and taijutsu up to S rank
Description: An empowered state of body achieved by blending natural energy with one’s physical and spiritual energy. The mode heightens performance on all levels by adding a new dimension of power to the user’s chakra. The state is a direct result of Senjutsu chakra circulating through the body. To enter this form, a minimum of 10% of the user’s maximum chakra reserve must be moulded into Senjutsu chakra, all subsequent technique employ Senjutsu chakra until the minimum cost (-10/turn) cannot be paid to sustain the mode. The user is resistant to damage, reducing 20 damage from all techniques for the duration of this technique. The user is able to passively sense chakra and his/her perception and reflexes are enhanced. Their ninjutsu and strength increases, empowering taijutsu and other close range physical combat techniques by +20. Additionally, the user is able to break out of Genjutsu, using Genjutsu release technique one rank lower than what he would normally be required to. Lastly, the user gains access to snake anatomy and other physical feats granted by Sage mode.
Note: Usable twice per battle . Must wait 2 turns before using this technique again. Perfect Sages can use either perfect or imperfect form thrice with a delay of 1 turn between modes.
Note: Imperfect Sages can convert a maximum of 30% of their total chakra reserve. Perfect Sages can convert a maximum of 40% of their total chakra reserve.
At the moment, before you reach Perfect State status, you are able to convert 30% of your chakra. So this is more practical in the Ninja World, where you will have plenty of time to just chill in a landmark and convert your chakra. So I'll try to put that in context in a moment. But basically, every turn of meditation converts 10% of your chakra.
In the NW, one "turn" outside of combat is one post in the world. This can be done every 45 minutes in a landmark. So not moving in a landmark and meditating will net you 10% of your chakra converted every 45 minutes. Note that when you're meditating any skill you currently have active, passive or active, is disabled. You are literally sitting still doing nothing, with no skills active, when you're meditating and converting chakra.
So let's say you have 1,000 chakra as your cap. After 3 full turns of meditation you will have achieved 300 Sage Chakra. Once you end the meditation you will enter Sage Mode, which will cost you 10 chakra per turn from that Sage Chakra pool. Additionally, all of your techniques will be enhanced by Sage Mode essentially, which will also pull on that pool of 300 chakra. Sage Mode will end once you exhaust this pool of 300 chakra.
Any questions?
Here are the full Activation Rules:
Activation Rules
Sage mode requires natural energy to be collected within one’s body requiring the user to meditate. The amount of time one dedicates to collecting natural energy determines the duration of his mode. In general, Sage mode lasts as long as the user has a minimum amount of Senjutsu Chakra circulating through the body.
A single turn of meditation converts 10% of the body’s chakra to Senjutsu chakra. An Imperfect Sage can convert a total 30% of his/her maximum chakra reserve to Senjutsu chakra at a given time. A Perfect Sage can convert a total 40% of his/her maximum chakra reserve to Senjutsu Chakra. The body state changes to Sage mode after first turn (10%) of meditation but does not consume chakra until the user stops meditating. Consequently this also means, meditation stops any passive or active chakra consuming skill the user has employed.
Additionally, Perfect Sages possess the ability to instantly activate Sage mode without meditation with 10% of their maximum reserve as Senjutsu Chakra once per battle. Naruto Uzumaki bios are able to instantly activate with 20% of their maximum reserve and up to 50% of their reserve. He is also able to use Sage Mode with his Bijuu Modes, the effects stacking together barring speed increases.