[A few days after Sleeper, Eilonwy hand delivers a letter for Loki to his cottage. In a very "I'm getting used to this specific alphabet" hand is the following letter in runes:]

Hail, Loki!
I hope this letter reaches your hands sooner instead of later. With the unpleasantness of the last few days, I'd thought about writing you a letter on the device itself but then realized that wouldn't satisfy either myself or what I wish to say properly.

First, I meant what I said in my comment defending you and your character. I still do. Secondly, thank you for taking the oath you did to help me learn to become stronger. I didn't expect to hear one of Llyr's oaths spoken back to me in a moment of self doubt and fear, but hearing it along with the promise you gave helped me in ways I can't properly put into words. Know that they helped, and I won't dishonor that by being anything less than a good student in our practices together. If you ever wish to reach out, I'm usually at my cottage, but I won't keep the burden of communicating on you, so I'll visit again in 1 day hence.

May you continue to remember how many of us here consider you a friend.

With health and good fortune sent,
Princess Eilonwy of the House of Llyr, Prydain