Ninth-grade weapon soul? Causal line!

When Obsideus Skipper stood on the altar, everyone held their breath unconsciously.
Sudden!
The sword spirit's voice, hurried and slightly panicked, rang in Obsideus Skipper's mind.
"Who the hell is your grandpa?"
Buzz!!!
Obsideus Skipper felt that his entire consciousness had fallen into a hazy land of nothingness.
There are all kinds of artifacts everywhere here!
Swords, spears, halberds, axes, hooks and forks.
Alchemy furnace, giant hammer, magic brush, limbs, shields,...