Because Nathan honestly believed that keyboards were invented by the devil (he was the king of the one-fingered typing, when he was forced around the demon machines) and didn't even remotely know how to work email, when he decided it was time to reach out to certain key players, he turned to an old-fashioned form of communication.
Some letters, then, written in a slightly shaky left-handed scrawl on parchment and sealed with wax (the Lady thrilled in that little touch; so much of the old elegance was lost, now, in the age of electronic ones and zeros and soulless typed correspondence) in what might be a familiar symbol. The water lily, after all, had once covered the Lady's lake. It was fitting that it should now seal Nathan's letters.
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( Letter to Mike )---
( Letter to Arthur )---
( Letter to Cecilia )---
And the last letter had no address. No real way Nathan could expect it to reach the intended party. But Nathan put it in the mailbox, stamp placed firmly on with more than a little bit of optimistic hope, believing absolutely in fate to have it find its way.
( Letter to Morgan le Fay )