Cecil and co. had already spent 5 days in the dungeon and they were very tired from the experience. It wasn't fun at all diving into a dungeon. Lucia for one immediately thought that the cons of dungeon diving outweighed the pros.
All the 3 got was a fatigued mind and body, plus Cecil's incessant complaints. The only positive thing was that they had a pretty decent harvest of monster subjugation proofs, mined a good amount of mana crystals and ores. Unexpectedly, they actually mined the legendary ore, Adamantium in the dungeon.
Silver was the one that found the adamantium when they passed by an inconspicuous area on the 9th floor.
They didn't have any mining tools and Silver communicated to Lucia that it was a rare ore vein since he felt the mana emanating from the vein to be very dense
