Gisu and others seem to have returned to the Labyrinth while I was feeling sorry for myself and came back with all the treasures from the boss room.
Many adventurers fell prey to the Labyrinth in its long history.
Magical items were plentiful there.
Moreover, they even looted the scales off the Hydra, or rather, those magic stones that covered its skin.
Those are magic stones that can absorb magical energy.
According to them, selling these can bring in an enormous amount of wealth.