The Werebear Treasure Room was nearby. It was the spatial wormhole right behind the Boss' corpse. Inside the room, there were tons of items.
After using the key, the spatial wormhole, which was floating in mid-air, slowly opened, and plenty of materials appeared before Lin Jie.
—'You have received 4 units of Ice Crystal Brick.'
—'You have received 6 units of Polar Ice Dust.'
—'You have received 10 units of Needle Woods.'
…
The treasure room contained a large number of construction materials, which could be used to build towns as suggested by its name. This included campsites, villages, and other buildings. It would usually take players a long time, large manpower, and many resources to spawn construction missions after conquering a city. The rewards for those missions were all those construction materials. However, the items would usually be low-grade materials like 'wood' and 'ores'.