black arms

1-5000 years- dormant psyche, is asleep

5001-30000 years- awake psyche, is the ability to talk to wielder

30001-75000 years- partial psyche, is the ability to modify wielder

75001-200000 years- full psyche, is the ability to show battle experience as abilities

200001-5000000 years- physically psyche, is the ability to create psyche elements as physical bodies

beyond years- unleashed psyche, is the ability to assimilate with the wielder

They can eat 1 of 3 things only-

1. souls- this will evolve the weapon abilities

lawful good: water lawful: defence lawful evil: fire

chaotic good: wind chaotic: plant chaotic evil: earth

good: light evil: dark

2. blood- this will evolve the weapon buffing

3. demon cores- this will evolve the weapons attack and damage

As time goes by they gain inner psyche dimension size. Allowing them to have more and more space to do things in while training their wielder and more.

To deal with the long time they can't move in the beginning they hibernate when not having a wielder.

The flow of blood can also pull them from their sleep.