Krighai, God of War

Sakuska's Glaive, The Kahn's Tiger Sword, Richtor's Guillotine, Kurhad's Axe, and many others are just some forms of the shapeshifting god of war Krighai takes.
Krighai was the first thing to ever be made by Sakuska, it is the 5th oldest thing in the universe, and it's the reason Sakuska won the battle against the rest of the four.
Krighai has never truly been seen, but it's believed it is a giant grey blob that split itself into pieces so it could act as every legendary weapon, see Krigghai isn't good or bad, it just wants someone to wield it, fight with it, use it, it wants to spill blood, whether that blood is of defenseless civilians or evil spirits doesn't matter to Krighai.

Krighai is fractured into over a dozen pieces, but this was by choice, it wants to be wielded by as many as possible.
When someone picks up Kirghai it instantly reads them, finds out what the new wielder likes, and dislikes, what drives them, and what kind of weapon they need, then they use this information to make a weapon perfect for the wielder.
Krighai makes even the most pathetic fighter a legendary warrior.

the only way Krighai gets unbonded by someone is through death, once a wielder dies Krighai slinks away and finds someone else to bring to greatness.
If someone wielding a Krighai weapon tries to get rid of it, it will just come back, if the wielder keeps trying to leave the weapon, the weapon will animate and kill the wielder.

no one worships Krighai, but lots look for it, they search the entire continent, picking up any weapon they can find, and some even scavenge fresh battlefields, in the hope of finding the weapon, these people are rarely successful, it seems as though Kirghai doesn't want them, but yet they keep trying.