Plus, she will also offer some trouble for Caitlin by way of threatening to reveal her Frost secret.
In the comics, the character is the head of a criminal-focused black market where the villains of Central City (and other places) can buy and sell all manner of weapons and other noteworthy objects.
It’s not quite clear how that story will get played out on The Flash, but it seems like we’ll get to see quite a few of the show’s other villains crossing paths with Black and her goons.
While we haven’t learned too much about what we can expect to see from Katee Sackhoff’s Amunet Black, we do know that she’s the crime boss employing that brooding Norvok dude, and that Caitlin/Killer Frost was also working for her.