It's just as mziab said. You know how each season/arc, each major villain organization has a sub-group that gets sent out first?
The Four Kings of Heaven (Jadeite, Nephrite, Zoisite, Kunzite) defer to Queen Beryl. Along with Queen Metalia and Monsters, they collectively make up the Dark Kingdom.
The Spectre Sisters (Koan, Berthier, Petz, Calaveras) defer to Rubeus, who defers to Prince Demande. Along with Saphir, Esmeraude, Wiseman, and Droids, they collectively make up the Black Moon.
The Witches 5 (Eudial, Mimete, Tellu, Viluy, Cyprine/Ptilol) defer to Kaolinite, who defers to Professor Tomoe. Along with Mistress 9, Pharaoh 90, and Daimons, they collectively make up the Death Busters.
The Amazon Trio (Hawk's Eye, Fish's Eye, Tiger's Eye) and the Amazon Quartet (Ves-Ves, Jun-Jun, Palla-Palla, Cere-Cere) defer to Zirconia. Along with Queen Nehellenia and Lemures, they collectively make up the Dead Moon Circus.
The Sailor Anima Mates (Sailor Iron Mouse, Sailor Lead Crow, Sailor Aluminum Siren, Sailor Tin Nyanko) defer to Sailor Galaxia. Along with Phages, they collectively make up Shadow Galactica.
And so, the Oppositio Soldiers (Oppositio Sin, Oppositio Nabu, Oppositio Marduk, Oppositio Nergal, Oppositio Ishtar) defer to Apsu. Along with Anshar, Kishar, and revived creatures, they collectively make up... Hell Destiny. This is reflected in the Oppositio Soldiers' attack names. Just like the Spectre Sisters had Dark Fire, Dark Water, etc. or the Witches 5 had Fire Buster and Charm Buster, the Oppositio Soldiers have Hell Freezing, Hell Dragon, etc.
The katakana shows the name pretty clearly as well: ヘル・デスティニー, or Heru Desutinii. "Her Destiny" would be "Haa Desutinii".