The Black Queen summoned her own sorcerers from The Underworld.
That Underworld place was originally found on her own planet.
Not this planet. She is a transplant.
She held an emergency council meeting to discuss how her Banshees and her Dragons could be killed.
"I was told that the Banshees live for hundreds of years", and Dragons for thousands. She spoke to Deadelon, the (her) Master Sorcerer from the Manx Galaxy.
"That is correct, my Queen".
"How is it that both have recently been slain?"
"How is this known? Do you have their remains?" Deadelon was careful in making any pronouncements.
"Ah, not of the Banshees, but we have four dead Dragon carcasses, rotting in a building in sector 2".
"Let me see those bodies, please".
The Queen looked at her security chief and flipped her hand at him, for him to deal with this request.
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All here were correct. Dragons can be wounded but killing is another matter.
Dragons are magical.
Only another Dragon can kill one of its own.
What none of these Other Universe beings knew, was that one of the Argonauts was Echion, the last remaining Spartoi that was spawned from a dying Dragons tooth.
All the swords of these Argonauts had some of his blood wiped onto them, early each day.
The Dragon's magic comes with, and within the blood. This power lasts only a day before the blood dries and loses it potency.
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There was one Banshee hiding in the dark corner, overhearing all that was said.
While noted, no one was alarmed.
Periclymenus's disguise worked perfectly.