My item was bugged and I couldn't read it, so I asked a friend for a screenshot. Here is a transcription of what it says, in case you are also stuck and don't want to use the spoiler guide:

Thinking Cap Components -
Thought Calculating Apparatus -
Clinkyclick Shatterboom - Engineering
Trainer -
* Loves the local Thunderspine Nest dish Erugosa makes here at the inn.

Downy Liner - Gryffin - Clinkyclick's
Assistant
* Loves a toothy Fresh Tyranha, found
swimming in the Cascades below Valdrakken

Crystal Ocular Lenses - Shakey Flatlap -
* Loves our local Dragon's Hoard bar a bit too much, high tab.

Fangli Hoot's Current Location:

Room next to the Barber Shop. Does not
like to stay in one place too long, so
need to catch her here.

Комментарий от Xadrakan

You will need to gather the following items from different NPCs around the Dragon Isles in order to form the Tricket-Out Thinking Cap:

1. Thought Calculating Apparatus
EDIT: You can directly purchase Thunderspine Nest from the AH instead of doing the gathering part below. Thanks to @Syrenead for clarifying that you will need to purchase 5 of them!
First, talk to Erugosa at The Roasted Ram to obtain a Thunderspine Shopping Nest List. Next you will need to procure 5 of each of the following items:

5x Apexis Asiago from Gorgonzormu in Valdrakken.
5x Thunderspine Tenders from Agyrahl the Butcher in Ohn'ahran Plains.
5x Latticed Stinkhorn from Sniktak in Loamm (Zaralek Caverns).

Once you have all the materials, go back to Valdrakken and talk to Erugosa and this time ask her to make you some Thunderspine Nest.

Now go talk to Clinkyclick Shatterboom (the engineering trainer) in Valdrakken and she will give you the Thought Calculating Apparatus.

2. Downy Helmet Liner
This one is pretty straight forward. Go to The Cascades in Thaldraszus (39 66 seems like a good spot) and kill the Hungering Tyranha until you get a Fresh Tyranha.

Now go back to Clinkyclick Shatterboom and talk to Gryffin to obtain a Downy Helmet Liner.

3. Crystal Ocular Lenses
Go to The Roaster Ram inn in Valdrakken, target the Odd Statue and /bow.

You will be teleported to Dragon's Hoard, a secret inn. Talk to Kritha the Barkeep and accept to pay the tab for Shakey (you will be prompted to pay something like 340g).

Once done, go back outside (simply run through the door at the opposite side of the room and you will be teleported back to The Roasted Ram) and talk to Shakey Flatlap (the jewelcrafting supplies vendor). Upon learning that his tab has been paid, he will give you the Crystal Ocular Lenses.

Final Step
Once you have all 3 items, simple click on the Thought Calculating Apparatus and you will form the Unfinished Thinking Cap, offering you the quest Unfinished thinking cap.

Go to the building to the left of the Barber Shop and talk to Fangli Hoot (26 53 Valdrakken) and complete the quest. Congratulations, you are now the proud owner of a Tricket-Out Thinking Cap!

Комментарий от Nightgecko

Safe to delete, serves no further purpose.

Комментарий от xLunacyx

Love how it's mispelled Thuderspine

Комментарий от Syradith

I finished the first two clues and got "The Inquisitive" achievement, but the game immediately skipped me to clue 7 instead of this clue....I obviously don't have the item for clue 7 and can't get any other quests to get it or make any progress, and neither can I get this note's clue/quest to appear (which I've read is supposed to be the next step after "The Inquisitive"). I can't get anything other than clue 7 to show up.

I only just started, so there's no account-wide progress conflicting with it or anything either.

So, I guess I'm just stuck and unable to obtain this item or progress the event at all?

Комментарий от DennisTheGreat

ZZzZZz

Комментарий от essmene

Source Xadrakan's guide

Paste 1/3 to 3/3 separate as they lead to the same NPC. The 5x ingredients give 10 Thunderspine Nests - double the quest requirement. Feel free to buy multiples to Sell on the AH - or buy from the AH to skip the first 4 traveling steps.

/way #2112 29.6 65.0 ThinkingCap1.1: Gorgonzormu Buy 5x Apexis Asiago
/way #2023 85.0 23.4 ThinkingCap1.2: Agyrahl the Butcher Buy 5x Thunderspine Tenders
/way #2133 54.0 56.6 ThinkingCap1.3: Sniktak Buy 5x Latticed Stinkhorn
/way #2112 46.4 46.4 ThinkingCap1.4: Erugosa Buy 5x Thunderspine Nest (Or sell some more on the AH)
/way #2112 42.2 48.8 ThinkingCap1.5: Clinkyclick Shatterboom Get Thought Calculating Apparatus (1/3)

/way #2025 35.8 67.2 ThinkingCap2.1: Kill A Hungering Tyranha for "Fresh Tyranha"
/way #2112 42.2 48.8 ThinkingCap2.2: Return Clinkyclick Shatterboom Get "Downy Helmet Liner" (2/3)

/way #2112 46.8 45.8 ThinkingCap3.1: Target Odd Statue and /bow to teleport
/way #2112 47.2 41.6 ThinkingCap3.2: Kritha Pay Tab for Shakey and Exit through door
/way #2112 39.0 62.0 ThinkingCap3.3: Shakey Flatlap Talk to him that you paid his debt for " Crystal Ocular Lenses" (3/3)

/way #2112 26.6 54.8 ThinkingCap4.1: Fangli Hoot Once you assembled the Thiking cap - turn in Quest here (also has a quest indicator)

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