Gloomlight Extract could be used in potions for night vision or flash resistance.
That was the description of the extract, but there was actually another line beneath the description.
[Component for Siren's Compass]
Despite not having the blueprint for Siren's Compass yet, the system appeared to be generous enough to inform him of the components of the compass.
Some might be exhilarated to learn of such generosity, but Xu Feng was the opposite.
Rather than being exhilarated, his emotion was actually in turmoil that the components for the Siren's Compass might be far more difficult than he initially calculated.
After all, when the system informed the players of the component suitable for an item, it usually meant two possibilities. One possibility was to explain the difficulty in crafting the item successfully in a subtle manner.
