Comand materia give this skill, sura have own skill. Both have same bug:
Creates an area around the caster where all enemies cannot move or attack, and become silenced for the duration of the skill. If the user of cursed circle uses any other skill, cursed circle immediately ends. The skill consumes 1 spirit sphere.
- in reality this is not constant aoe skill, cause "immobility and silence" its some kind of "curse" if you cast more than one this "curse" after use ANY skill, caster can move again (and use skills) cursed target - not. Cursed target cannot move or use skills, autocast remains (from shadow or other items reacting on damage)
Second bug - if used by NOT sura class, not consume spirit spheres. You still need at least one to cast Cyrcle, but actually you can put "bahamute" cast rising dragon, take it off, and use Cyrcle untill time of spheres is expand. As the Sura using Any skill (self buff) you can move and act again, target - not.