[Shujin]

I couldn't find it via search so I ask again here:

1.) Whats the world/planet that the great six are on as it's whole called? Is it really Sigrogana aswell? If so are there alternative names some cultures use?

Reminds a me alot on the Vegeta meme. "Me, My son or the planet?"- "Yes"

2.)Illusions. We know that they can actually trick people into sustaining true injuries in certain conditions. So sentient beings can be physically harmed in a sense. How much does it effect non-sentient things? If people are made to believe that a house burns to ashes, will it burn to ashes or be entirely unaffacted? Or does this simply depend on the skill of the Illusionist and his abbility to "Bend reality"?

3.) Illusions in medical sense. In the manga/anime Katekyoo hitman Reborn, there was an illusionist who basically tricked a girl that had malfunctioning or even absolutely missing organs to work, which allowed her to keep on living cause "Illusions are real aslong as you believe them" in their lore. Is something similar possible here?

4.) Does fighting at the arena for money count as gambling, Aka would it be considered illegal by the Law?

5.) The currency Murai is basically just a value for stuff like Gems, coins, gold and all that. So I assume the market is globalized so there are no other real currency used in different countries, right? Like oniga having their own currency?
I am asking because someone mentioned some exchange rates ICly and it made no real sense to me in a globalized market like murai.