Which blade oil should I use against the Wild Hunt?

The blade oils provide quite a substantial advantage, especially once you can upgrade to the superior versions that do 50% additional damage. But you have to know which oil to use against each foe.
I can't find the Wild Hunt warriors in my bestiary, I've no idea which oil I should use against them and their leaders like Eredin. Which oil is effective against them?
Best Answer
The correct answer was found in the Official Prima Guide - it is Elementa Oil.
Edit: my old link to the forum no longer works. There is a picture from the book in another answer in this thread. I can confirm that it's authentic and correct.
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The Witcher 3 , The Correct Blade Oil To Use To Kill The Wild Hunt And Eredin
More answers regarding which blade oil should I use against the Wild Hunt?
Answer 2
I know this is old, but searching online led me to this. I'm pretty sure other people are looking for answers as well. So here you go. This might help.
Answer 3
They are specters, so you should use "Specter" oil.
Answer 4
Elementa oil is used for the Hounds of the Hunt. I imagine it would be the same for the riders, considering the same elemental design of their armors/weapons. Seems to make a difference in game to me ?
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