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Crystalfly Trap is a gadget in Genshin Impact 4.0 that lets you catch Crystalflies. See how to get the gadget, how to use it, and all known info about it here!
List of Contents

You can get the Crystalfly Trap Gadget by leveling up your reputation in Fontaine to level 3. You can unlock the Fontaine Reputation system after completing the Chapter 4: Act 2 Archon Quest and the Steambird Interview world quest.

After acquiring the crystalfly trap device, go to your inventory and select the gadget to deploy it.

Interact with the gadget again once it has been deployed to insert materials and activate it. To get the gadget to work, you must insert a total of 30 ores.
Ore Chunks and Crystals Farming Guide

After activating it, you must wait a total of 7 days to receive 15 crystal core.
Crystalfly Trap
|
Rarity | 4 |
|---|---|---|
| Type | Gadgets | |
| Effect | None |
A Crystalfly Trap, developed by a senior researcher named Fawitzki from Fontaine Research Institute of Kinetic Energy Engineering. After being properly deployed and inserting the required materials, this device will start working and lure Crystalflies inside. Fawitzki once led research on Low-Temperature Lighting Devices,
which required a large amount of Crystal Cores as research materials, which led to the development of the Crystalfly Trap.
However, the project was suspended for various reasons. We are here to commemorate the diligent Mr. Fawitzki. We sincerely hope that there are those who will carry on his research. The Institute will provide maximum support in any areas deemed appropriate.
The biggest issue and a turn off for many is that the cooldown is exactly 7 days, not 6 days and 22 hours like the Parametric Transformer, meaning there will inevitably be drift of time between uses. Eventually, one would have to move their collection day to the next day in the week, and so on. Also, it’s 15 cores, which one can get in just a few minutes, even passively now with the way they are placed in Fontaine. This device is pretty useless.
Crystalfly Trap Gadget Guide



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This can now be purchased at the blacksmith from Mondstadt and Liyue.