Former crawlers who tapped out at the start of the tenth floor and have lived millennia in the Syndicate since.
Griffin and Morales both exited the dungeon as tenners — those who tapped out at the start of the tenth floor — a season or two before Rosetta's crawl, which makes them literally thousands of years old. Carl notes they behave nothing like it: they act like a pair of dumb eighteen-year-olds who just joined the Marines and don't know what they signed up for.
Their existence, along with Meeps scraping by as a street artist in Alpert, leads Carl to the uncomfortable realization that this is fairly normal for people of the Syndicate — that the general citizenry of the galaxy are all similar to humans in countless ways despite vastly different anatomies, cultures, and environments. The knowledge unsettles him the same way the Iron Tangle did, when he knew he was missing something important. The squad name The Tenner Wraiths takes its identity from the term.
Ex-crawlers of all species who look and act far younger than their millennia of post-dungeon life.
A category of veteran ex-crawlers now filling out the ranks of Carl's army.