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For a twist - if you are on Virtue you can ask Mab Queen of Winter to come and help you as repayment of her favor.
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That's a really cute and clever idea right there! An in-game reward in the form of a "summonable" PC ally. 
I may have to steal that from you, as a way to justify building a vanity arc around my toon.
In the way of the Fey you have a deal struck - often the deal does not go the way you would like it or expect it to
Mab grants you knowledge and then with too much knowledge she will not let you go. Now everything twists with favors upon favors - while Nuada does get his hand back due to you - it is Mab who pulled the strings - Nuada being of the Fey understands his favor is owed to Mab and not you!
So you will have a favor due but beware collecting
Feybound Arc 186129 Auto 50.
Mab Queen of Winter is known to be one of the most clever of the Fey.
She asks if you are sure you wish to learn more about the Fey?
1. Since you do..........she sets you up. You find a book about Nuada Silverhand and the plot begins to thicken.
2. Mab now says you know too much to stop now and "asks" you to help Nuada find his hand.
3. You do so and now Nuada returns to his kingdom of the Tuatha De Danaan to best Logh in a fight to once again take his throne since with his hand he is without blemish.
4. Now Nuada owes Mab a favor and showing her cleverness Mab has you, Nuada and herself to face down Aurora Summer's Queen as she tries to extend the warmth of Summer all year. Logh was working for Aurora and now she faces being "balanced" into the normal seasons again.
For a twist - if you are on Virtue you can ask Mab Queen of Winter to come and help you as repayment of her favor.
**Edited for fat finger spelling.