Some questions regarding communions

[shard]

1) If a communion SLAVE casts a self-buff, does this buff apply to the whole communion? Including communion master(s)? What happens if a communion self-buffer dies? Do the buffs go with him too?

2) Carrying on with the last question, I assume all single target spells count, but what about a magepriest communion master blessing himself?

3) Does the ai usually script communion master/slave spells automatically, and would it ignore a script if the opponent is considered 'weak'? I was thinking if a communion master dies... would one of the slaves recast communion master to make use of the communion?

4) Any other general tips on using communions would be welcome! Is it only worth it if you want to cast major spells in a big battle, or do ppl start using it as soon as its researched so that their mages can go on forever?

Thanks!