A special gem from the Elder's Recess. The color of a sinking sun.
How to get Twilight Stone
This item can be obtained by finding the unique gathering point spawning only during "Upsurge: Amber Deposits" in the Elder's Recess. Gathering it for the first time will unlock the Wyvern Filet ingredient at the Canteen.
To get to this item, you need to complete the Cultural Exchange: Gajalaka Linguistics II critical bounty which unlock access to the Gajalaka hideout.
Then start from their camp and look for a passage to the south:
Simply follow the path, careful to not jump down at the end, and it will be here along a Beryl Deposit: