My game thoughts are
- Black blood - is a very subtle ability and if you keep a few models with black blood together it can make a difference.
- Bond - simultaneous activation is always good.
- Flight and Float - will allow direct movement and fits with Lilith and her brood.
- Twisted thoughts and Thought twisted - One wounds a target and the other heals combined with Same Malignant Force allows those terror tots some survivability.
- Drink Blood - heals Lelu and Lilitu using Same Malignant Force. Very good.
- Claws - are paired and poison 2.
- Barbed whip - has a 4" melee range.
- Impure Thoughts - If this work, Paralyzed is a real problem, as it last until the end of the models next activation.
- Lure - Brings a slightly hidden model closer.
One possible 30SS list would be
Primordial Magic totem 2
Terror Tots x 2 6
Young Nephilim 6
2 left over to boost SS cache to 6
Try and get the Terror tots to grow to Young Nephilim. Might even get a mature but not important. You could companion Lelu and then get to play three models in a row, Lilith, Lelu and lilitu.