Astral Weaponry

Astral Weapons were created on the instruction of The First Avalon King, who feared that The Empire he had founded would eventually fall. To prevent this, he gathered many materials and hired many "mages" throughout the world to make strong weapons and defenses. The creation of the Astral Weapons are the result of their efforts. however almost half of them were lost during a civil war about five centuries before the start of The Second War. Several Astral Weapons have been seen to be destroyed; it is not known how many of the original remain. Many Astral Weapons were created from the remains of Beast that had unique powers, imbuing the equipment with special abilities. Many weapon and armor type Astral Weapons were forged from a rare metal called Kahliir Dwiin (Astral Steel) Astral Weapons are not limited to one ability; some are known to have secret powers that are yet to be discovered, and some have powers that are lost to history, they even have divine souls inside of them, however the gods have started making more of these powerful armaments. 
Astral Weapons are an interesting series of souls... Each stage different from another.

S1 Stage one artifacts are the most deadly first made by their respective Astral.

Beta Beta Stage artifacts are highly unstable.

S2 Stage 2 are often used by the respective Lord who is deemed the highest in worship, as well as leader of that region.

Delta Delta Stage are used by Commanding officers of certain armies, these weapons are less unstable

S3 Stage 3 are used by regional Knights called Wardens, often used to protect their land from a unwanted titans (Divine Beast) attack 

S4 Stage 4 are refined weapons used by the Astrals as a connection weapon to fuse all the weapons together to make the ultimate weapon, or in general to give to their demigods.

S5 Stage 5... The fusion artifact of everything artifact.