Rank rules
Depending on your rank will decide on what level techniques you can use, this is shown below.
Rank 5 - Can use up to S rank - Can claim a title.
Rank 4 - Can use up to A rank - Can learn to use haki/Can have a mythical Zoan devil fruit
Rank 3 - Can use up to B rank - Can have a Logia Devil fruit
Rank 2 - Can use up to C rank - Can have a Paremecia Devil fruit
Rank 1 - Can use up to D rank - Can have a Zoan Devil fruit
Bellow are the relative kind of damage for each rank attack:
D rank - 00-05 Damage - Lose no health
C rank - 05-10 Damage - Lose 00-05 health
B rank - 10-15 Damage - Lose 05-10 health
A rank - 15-20 Damage - Lose 10-15 health
S rank - 20-25 Damage - Lose 15-20 health
You lose health respectively due to the effort it takes to perform attacks, this way you have a chance of beating a logia user.
To find out what rank you are, check the rules in the grand line.
Depending on your rank will decide on what level techniques you can use, this is shown below.
Rank 5 - Can use up to S rank - Can claim a title.
Rank 4 - Can use up to A rank - Can learn to use haki/Can have a mythical Zoan devil fruit
Rank 3 - Can use up to B rank - Can have a Logia Devil fruit
Rank 2 - Can use up to C rank - Can have a Paremecia Devil fruit
Rank 1 - Can use up to D rank - Can have a Zoan Devil fruit
Bellow are the relative kind of damage for each rank attack:
D rank - 00-05 Damage - Lose no health
C rank - 05-10 Damage - Lose 00-05 health
B rank - 10-15 Damage - Lose 05-10 health
A rank - 15-20 Damage - Lose 10-15 health
S rank - 20-25 Damage - Lose 15-20 health
You lose health respectively due to the effort it takes to perform attacks, this way you have a chance of beating a logia user.
To find out what rank you are, check the rules in the grand line.