communion (?)

[BigDisAwesome]

Nope. The AI is gonna do what it thinks is best, which might be astral spells or might not.

Generally, communions aren't used for everyday run of the mill spells like fireball. They're mostly used for big battlefield enchants, and for buffing your mages quicker.
I don't really use communions myself yet. I just don't see the benefit to it when you could just make a booster or two to buff your paths.