Speak with Matras on Hellbound. He wishes to obtain blueprints of the Tower of Insolence to satisfy his curiosity.

Reports indicate that the Ranku and the Demon Prince possess these blueprints.

Once you obtain the required blueprint items, return to Matras. He will take a moment to examine them for authenticity — just wait briefly.

Reward

Rough Ore Of Fire
Rough Ore Of Water
Rough Ore Of The Earth
Rough Ore Of Wind
Rough Ore Of Darkness
Rough Ore Of Divinity

Additional Privilege

Completing this quest grants an extremely valuable benefit:
You gain the ability to teleport directly to the Tully Workshop via NPC Deltuva, located at the Steel Citadel tower — no need to pass through the Tower of Infinitum anymore.