Current time

After gathering information about the outside world.

He realized around 31 years had passed since he came to this world.

The most significant event that happened recently,

"The execution of the pirate king", happened 5 years ago.

So, through a rough calculation.

It could be deduced that there were around 19 years before the start of the cannon events.

Similarly, another significant event was the being of the great pirate era, which followed after the last words of the pirate king.

Due to the great pirate era, there was a huge influx in the number of pirates.

During the large march of pirates, huge changes started occurring in the sea.

The pirates he had recently found were also one of the many, that sailed the sea in search of one piece.

He calculated that there may be more ships coming here but, wasn't too sure about that.

But certain things that were destined to happen had already happened.

Gecko Moria had probably fought and lost against Kaido, losing his entire crew in the battle.

He must be in the process of recuperating from his loss and forming a new crew.

Also, the youngest member of the seven warlords ' Boa Handcock was 29 at the start of the canon.

So, assuming she was selected as a warlord in her below 18-20.

There should be roughly 9-10 years before the start of the warlord system.

Assuming that gecko moria was selected as a warlord of the sea after he started building his zombie crew in the Florian triangle for a while.

So, by rough estimates, there were only around 8-10 years to complete his preparation to face the new world.

As he finished his plan he noted it all down in a notebook he had found in the musical hall, for practicing music.

There was another note beside it that had a description of characters and their ability, personality, and devil fruits (if any).

As he finished his current task Brook went down to the lowest deck of the pirate ship.

There were individuals, kept in a row while frozen in ice.

At the top of the deck, after the questioning ended, the brown-haired pirate stood bewildered after dealing with the skeleton.

As he was absent-mindedly staring into the fog a voice jolted him out of his current daze.

"Take this"

Saying so a child of around 9-10 years old, gave him a sheet of paper.

Taking the sheet of paper he observed its contents.

RULES OF THE SHIP

•Don't kill the child

•Make sure the kid follows his (own) rules.

•Don't go to the last three decks.

•Don't damage the ship

Looking at the list the pirate, gave the child a questioning gaze.

The child simply shrugged his hands indicating his disinterest.

Feeling a bit tired, the pirate sighed..., and asked once again.

"so what happened after I passed out"

The child was about to answer the question instinctively, but as he was about to utter some word, he went silent and shouted unexpectedly.

" I won't talk to a filthy pirate"

He looked at the note once again, reading the first rule he managed his temples and sighed once again.