The Collector revealed the location of the Hollow Halls in the Kindlewastes. To enter, you will need a key. Craft the Key with the Collector to proceed.

The Collector revealed the location of the Hollow Halls in the Kindlewastes. Descend there and reach the end to please the Collector. You will require a very high Shroud Passage Level to persevere. You should bring your best glider. This will not be an easy task. Gather your strength and your allies, if present, to prepare yourself accordingly.

You've found the Hollow Halls in the Kindlewastes. Descend and reach the end to please the Collector.