Today's PTR build adds the title for Shadowlands Season 3 Mythic+: the Cryptic. It also adds the title "the Cryptic Hero", which will likely be given to the top Mythic+ at the end of Season 3.
New Character Titles NEW %s the Cryptic NEW %s, the Cryptic Hero Achievement Changes Attain a Mythic+ Rating of at least 1850 during Shadowlands Season Three. Read more on wowhead.com