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You only get the portal by killing bosses I suppose. Use a speed set and run bracken bridge kill the boss and hope a portal spawns. Enter the portal to be teleported to a random town or deary island....

Well you have to go through the portal when it spawns its not despawning quick tbh. You are send to dears island then if you go through it. If game decides to unlock you a new map you will auto send...

I don't think it's equal to leprechaun banner since I don't see as many Wings as the lep banner itself. Wings are worth more tho.