You can't be leader of guild on two different worlds if you use only one account. It mean that you can have only one guildhall per account.
Please note that only Premium players can become guild leaders or vice leaders. Also, keep in mind that there must not be more than one guild leader or vice leader on one account. Thus, for example, it is not possible to have a guild leader on one world and a vice leader on another.
I tried to create a new guild on another world on my account but it doesn't work:
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