Lilith's husband, Samael, has been castrated. In
order to have sexual union with him, they must use a
third character, BlindDragon. I'm not sure I want to know
how this works. See also Pardes Rimmonim 186d
Bacharach, 'Emeq haMelekh, 84b, 84c, 84d
Lilith is a harlot who fornicates with
men. She has no mating with her husband, for He [God]
castrated the male and cooled
the female. And she becomes hot
from the fornication of men, through spontaneous emission.
And enough of this....
(Patai81:463)
  This Lilith -- the Merciful One save us!-- has
dominion over children who issue from a man who has
intercourse at candlelight, or with his wife naked, or at
times when he is forbidden to have intercourse. All those
children who issue from these mentioned, Lilith can kill
them any time she wants to , because they are delivered
into her hand. And this is the secret of the children
laughing in their sleep when they are small: it is from
Lilith who plays with them. And I heard that when a small
child laughs during the Sabbath night or the night of the
New Moon, it is because Lilith is playing with him, and
it is well that his father or mother or anyone who sees
him laugh should tap his nose with his finger and say:
"Go from here, you accursed one, for you have no resting
place here!" Let him say this three times, and each time
he recites this incantation let him tap the child's nose.
And this is very good, for it is in the power of Lilith
to kill them when she wants to. And since she has
permission to kill these infants, these souls are called
Oppressed Souls.
(Patai81:463f)
  Blind Dragon rides Lilith the Sinful -- may she be
extirpated quickly in our days, Amen!-- And this Blind
Dragon brings about the union between Samael and Lilith.
And just as the Dragon that is in the sea (Isa.
27:1) has no eyes, likewise Blind Dragon that is above,
in the likeness of a spiritual form, is without eyes,
that is to say, without colors....
(Patai81:458)
  Samael is called the Slant Serpent, and Lilith is
called the Tortuous Serpent (Isa 27:1). She seduces men
to go in tortuous ways....
  And know that Lilith too will be killed. For the
groomsman [BlindDragon] who was between her and her
husband [Samael] will swallow a lethal potion at a future
time, from the hands of the Prince of Power. For then,
when he rises up, Gabriel and Michael will join forces to
subdue and bring low the government of evil which will be
in heaven and earth.
(Patai81:468)
Bacharach, 'Emeq haMelekh, 121b
And he [Blind Dragon] is castrated so
that he cannot beget, lest [his offspring] annihilate the
world. (Patai81:458)
Bacharach, 'Emeq haMelekh, 140b
The Blind Dragon is between Samael and
the Evil Lilith. And he brings about a union between them
only in the hour of pestilence, the Merciful One save us!
And he is castrated so that the eggs of the viper should
not dome forth into the world. For were it not so, they
would annihilate the world.
  And that kind which is called Lilin are full of hair from their
heads down to their feet, but on their heads they have no
hair and all their body and face is full of hair. And
this Lilith has fourteen evil times and evil names and
evil factions. And all are ordained to kill the children
-- may we be saved!-- and especially through the witches
who are called Kinder Benimmerins in the
language of the Ashkenaz [German].
(Patai81:458f)