Some questions regarding communions

[shard]

Thanks to the answers, i've thought of even more questions!

a) Can non-astral nations get access to communions by trading for crystal/slave matices?

b) Also, a slave which has been drawn on will not act - What if you set him to attack closest or script him for actions that won't cause fatigue? Some fuzzy ideas of making SCs and thugs communion slaves are floating around in my head - is this a feasible idea?