Though it was wreckage, it was still Orichalcum; with his current level of Golem Transmutation, he was able to change its shape and preserve it.

However, he knew that he could not genuinely manipulate it as he wanted to.

“If I could beat Orichalcum to turn it into weapons, I would be a god right now instead of an Undead,” said Datara. Orichalcum was a wondrous material for a blacksmith, and yet it was impossible to manipulate.

It could not be melted even by magma. No file could shave its surface off and even if it bent after being struck, it would soon return to its original shape.
Because of this, not even a first-rate blacksmith could turn it into weapons or armor.

It was said that any blacksmith capable of doing so would likely be praised as a divine craftsman.

“But it’s possible to use it in various ways, isn’t it,” said Vandalieu. “Like turning it into flat pieces and using them as a shields, or turning it into lumps to use in maces and hammers, or using them as ammo for the catapults.”

Shields boasting the greatest physical and magical defense of any shield in the world, and blunt weapons capable of tearing through any barrier like paper. Leaving aside the joke of using the Orichalcum as ammunition for the catapults, it should be very useful.