you got my meaning exactly!
This poem is about Gilles de Rais (or Bluebeard)(1404-40), perhaps you know of him. He was a great friend of Joan of Arc (!), and a heinous satanist, who was finally put to death, accused of the torture and murder of more than 140 children.
The atmosphere I wanted to conjure up in this poem is one of an immensely evil man who has summoned up the spirits of those condemened to burn in hell so that they can reveal to him the secrets of the netherworld. This could imply both of your meanings, as the secrets of hell may include the summoning of familiars, or the creation of similar diabolic creatures.
Not that we need hell for that though!
I'm glad you enjoyed it!
"Wir wollen nicht Wert und Sinn ... wir wollen Unwert und Unsinn"