The Revival Catalyst has been enabled for testing on the 10.1.5 PTR and to convert items, you will need Season 2 Champion gear, or higher.
The Revival Catalyst will be enabled on live servers on June 13, 2023. During that week, all characters on your account will automatically gain the first charge without doing anything. Catalyst charges are no longer tied to completing quests.
Patch 10.1 introduced a new gear upgrading system and multiple types of gear. One interesting change we spotted on the 10.1.5 PTR is you can’t convert Season 2 items below the Champion rank. Such items will be greyed out and the Catalyst won’t accept them.
We also noticed the amount of charges has been increased to 8 (up from 6), we’re not sure if this will make it live, though.