Vault of the Wyrm Prince: The Final Rumor...?

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Very strange... I drew what would have been the sixth and final rumor, and got "The Tower" Tarot card. I'm a little stumped, and I don't know where it came from. I don't even own any Tarot cards! 

I don't think there are any towers in this adventure, even.

Just... odd. Ignore it for now, I'm sure it's nothing.

EDIT: Actually, I drew two cards today, but I was so thrown by the strange last card that I forgot to mention the fifth one about the great emerald.