The first place he considered was deep within the mountain. However, he also realized how hard it would be to find if he did that. After a while, he figured that he might as well put it there.
However, he would also create a path 'directly' to it. It would be open to everyone and not hidden, but one would have to complete challenges to reach deeper and eventually reach the shield.
He would also make other treasures at the other checkpoints in order to encourage better challengers.
Zhou Fan planned the layout out before he sunk deep into the mountain without leaving a mark or any sign that he had been there. He continued to sink down until he reached 100 miles deep.
When he reached that point, Zhou Fan pushed the dirt around him backwards until a cube of air 10 feet wide, 10 feet long, and ten feet in height was created. He then created wood Qi to form a podium where he placed the shield.
Around the room, he placed many formations and restrictions. They would ensure that nobody weaker than Zhou Fan would be able to break in the room without following the path. He would also have to remember to upgrade the strength of the arrays and formations after a while.
Zhou Fan then created a square hole in the walls and the formations. He started to push the square hole back until it formed a hallway. He pushed that hallway on and on, lining the sides with arrays and formations equal in level to the ones in the other room, until he reached one of the mountain sides.
On the side of the mountain, and extending far below it, there was a square shaped hallway that defended one of the world's greatest treasures.
After he made the path towards the shield room, Zhou Fan prepared to make the challenge rooms. In total, there would be ten challenges that one had to pass in order to get the final treasure.
However, even if one didn't get past all the rooms, they would still get lesser rewards for passing whatever rooms they passed.
In order to make sure someone strong didn't repeat the challenges over and over again, farming treasures, he put a formation at the entrance that would allow a person to only challenge the entire thing once a month.
After making sure that there was no way anyone could cheat their way through, what Zhou Fan decided to call a dungeon, Zhou Fan walked through the halls, expanded them to be 50 feet wide, 50 feet tall, and 50 feet long, and added booby traps and monsters.
Among them were skeletons and demonized animals. After that, Zhou Fan went to the one-tenth point of the dungeon and created doors to block the path that led through the rest of the dungeon, forcing everyone to go through them.
He also put doors on the other side so that anyone who defeated the boss he was about to put down would be able to leave the room. They wouldn't unlock until one defeated the boss, however.
As he stood in the middle of the room, Zhou Fan thought about what type of bosses to put. Truthfully, he was deciding whether or not he would give the bosses a theme or make them completely different.
After thinking for a while, he chose to create a theme. He would make the first nine bosses the sons of the tenth one. They would be a new species, but they would be similar to turtles. The idea of turtles also fit the shield since they were animals who heavily relied on protection. He would also give each of the bosses different affinities, the tenth boss's being fire.
After getting the incredible idea, Zhou Fan got to work with the first boss. Its affinity would be water. It would be the size of three humans, but it would be pretty weak, at the third level of foundation establishment.
Basically anyone, regardless of talent, would be able to pass the first boss in due time. That is also why he chose to put a weak reward. The reward would be a bottle of foundation establishment pills that would speed up cultivation.
For the second boss, he put the same room layout, but the boss looked different and its affinity was wind. For the third, he did the same, but its affinity was metal.
He continued to repeat the pattern until the tenth boss. The ninth boss's strength was already at the tenth level of void traversing. It would be good to mention that the bosses were artificial beings created by Zhou Fan.
As the average and top strength of the world increased, their strengths would too automatically increase, but slowly. He estimated that the tenth boss's strength would cap at tenth level space shattering and Zhou Fan would just leave it that way.
As for now, however, its strength was at the first level of space shattering. That was still much higher than anyone else's in the Zhou World, but Zhou Fan didn't want anyone to be able to beat the dungeon at that point in time.
The tenth boss was much bigger than any of the other bosses and its main attack was breathing fire, despite not being a dragon.
Its back had spikes and it was the most powerful existence in the universe besides Zhou Fan. Its creation proved that Zhou Fan's power was indeed remarkable.
After creating it, Zhou Fan didn't put a reward unlike the other times. Instead, he simply made it drop a key when it died. The key would unlock the room with the shield.
Zhou Fan wasn't worried about the shield becoming useless once anyone was able to defeat the boss.Since it was a growth type weapon, it would forever be useful, especially due to the fact that only Zhou Fan would be able to create them, ever.
After all, growth type weapons were far too dangerous to be allowed. The only reason Zhou Fan was doing it was to create some strong people.