Creation Catalyst Preview - Location, How it Works, Tier Conversion Costs

wowhead.com:

On the latest Eternity's End 9.2 PTR build, the Creation Catalyst interface has been made available for testing, and we have a preliminary look on how to convert items into tier pieces! It is worth noticing that actually upgrading pieces is currently not testable. Below, we have all the currently known information on the Creation Catalyst.

The Creation Catalyst is located all the way south in Zereth Mortis, high up in the air within the Catalyst Gardens. You first come across the Creation Catalyst during Chapter 4 of the 9.2 Campaign, Forging a New Path. As this chapter is required to unlock the teleporter leading to the Sepulcher of the First ones raid, at least all raiders should have it completed by the time the Creation Catalyst is available for use. It is worth reminding that the Creation Catalyst will become available at Week 8 of Patch 9.2. Currently, likely as a bug, flying is required to reach the Creation Catalyst, but General Draven is supposed to be able to fly to the console if you don't have flying unlocked.

The Creation Catalyst interface is very simple — Simply input one item there, and a tier piece will be output. The Creation Catalyst also has a timer in case your cooldown is not charged, but there is currently no timer on when the cooldown is supposed to come up. Clicking the input window displays all items that are compatible with the catalyst. As of the latest blue post on the subject, you will initially be able to convert one tier set piece per week, but the timer between conversions will shorten as the patch progresses.