Tamers and grimoires level 

First level up to ninth level. 

1 After reaching the ten-tier, the grimoire evolves to iron rank and its host evolves to reach the first order… and so on... up to ninth orders.

Beasts levels - Aura color.

[Basic tier] - Ivory 

[Intermediate tier] - Silver

[Advanced tier] - Emerald 

[King tier] - Green

[Emperor tier] - Blue

[Legendary tier] - red

[Demi-god tier] - Crimson

[Demon tier] - Black

The Grimoires' ranks are Copper - Iron - Silver - and Gold.

There are special grimoires. You will discover more about them as the story progresses.

Discord. https://discord.gg/3GWbQnpb3d

Any questions, don't hesitate to ask me.