Each Tartaros member represents a curse ability
Introduction
Curse Manipulation is an ability to inflict curse and/or control the nature of curses. Generally curse ability is shown to be ability to give misfortune.
In fiction, it has many other uses, which can render opponent defeated such as Death curse, Pain curse, debuffs and many more. The power and application of ability depends upon the user.
Users
Tartaros guild and Bloodman (Fairy Tail)