After parting ways with [Dragon God's Might] and strategizing separately in the [Hall of History], Yang Yu should have realized that they were exploring different instances of the same maze.
Although the mechanism behind the Underground Maze is unknown, each maze appears to have its own prize pool. The maze will only be considered completely defunct once all the prizes within the pool are claimed.
The [Hall of History] likely follows this rule too and possesses a vast prize pool. The maze will stop refreshing only when all prizes in the pool are claimed.
And once an item is removed from the prize pool, it's gone for good.
The list of redeemable prizes Yang Yu can see now consists of treasures from the prize pool.
They are not the only adventure group strategizing the [Hall of History], at least also [Dragon God's Might]...
If [Taunt] falls into their hands and they don't intend to use it, maybe it could be obtainable.
