[apoger]

SUPERCHARGED ABYSIAN WARLOCKS

For this trick you will need 8 astral mages to act as communion slaves. Warlock apprentices will do, but if you find cheaper ones go for it.

You will also need 1+ Warlocks.

Have the 8 slaves cast communion slave.

Have your Warlocks cast; Communion Master, Power of the Spheres, have one cast Light of the Northern Star (or carry a Banner of the North Star).

At this point the Warlocks will have Blood-7 Astral-7 Random-5
If you are willing to cast Hellpower (it horror marks your mages and attracts horrors) you can bring the Warlocks up to Blood-9 Astral-9 Random-7

This is all without magic items or empowerment.

Is it worthwhile to go through the hefty effort to get this effect?
That depends on you games circumstances. Just keep in mind that it's a potential tool in the toolbox.